As Little Otter Family Camp resumes for the summer, owner and director Mackenzie "Mack" Granger is running the camp for the first time on her own. With her ex-husband pressuring her to buy his shares of the camp, Mack scrambles to keep the cash-strapped camp afloat. She even contemplates a buyout offer from Roger Shepard, the sexy but arrogant owner of Ridgefield, the upscale resort across the lake. It’s also the first year Mack’s fifteen-year-old son Buzz is a counselor in training (CIT), and he vows to make it a legendary summer. Buzz makes fast friends with Kip, a fellow CIT who is hiding a secret. And Mack’s trusty handy man Cole may be developing more than a professional interest in the newly-single camp owner. Meanwhile, lead counselors Robbie Matthews and Sarah Brennen resume their annual summer romance. But their relationship is different this year as Sarah faces stress over the loss of her swimming scholarship and finds her thoughts wandering across the lake when a sexy older writer moves into Ridgefield.
Mack announces it’s time for the annual "Capture the Flag" competition at Camp Little Otter and nobody is safe! Mack’s ex-husband Steve arrives unexpectedly t camp looking for a place to crash after a fight with his girlfriend. Mack reluctantly agrees to let him stay and participate in the competition. Sarah and Cole tackle the game with ferocity and are determined to beat the others. Kip chafes at Marina’s flirtations with another camper but is surprised to find he has attracted the attention of fellow CIT and "mean girl," Chloe, who takes Kip prisoner during the competition. Meanwhile, Robbie comes to his mother’s aid when her gambling gets her into trouble once again.
Mack and the team prepare to host the annual mixer with Camp Ridgefield. Despite his inexperience, Buzz is pumped to Deejay the event and hopes it will score points with the ladies. Mack contemplates putting in a cell phone tower after she discovers Little Otter has lost a longtime guest family to the more modernized Camp Ridgefield. Kip' crush on Marina deepens and he helps her cope with the mean girls who continue to torment her, including Chloe, who kissed Kip during Capture the Flag. Meanwhile, Sarah gets a surprise visit from her swim coach, who makes an offer to keep her on the team...with some conditions.
It's time for the annual Valentine's Day in July festivities- complete with Valentines Grams and a carnival - with all the proceeds benefitting the American Heart Association. Mack gets an unpleasant surprise when Roger wins the raffle for her private tour of Little Otter. The two spend their time arguing and flirting and eventually give into their mutual attraction. Kip sees his chance with Marina slipping away as fellow CIT Greg, gives her a very public proclamation at the carnival. Sarah finds herself increasingly intrigued with Miguel Santos, an older writer who is staying at Ridgefield, across the lake.
As a record-breaking heat wave descends upon Camp Little Otter, everyone tries their best to keep cool. Buzz, who is celebrating his 16th birthday, begins planning "the greatest party Little Otter has ever seen." Sarah’s trip over to Camp Ridgefield to borrow a much-needed generator gets interesting when she runs into her secret crush Miguel Santos. When Buzz spies Kip kissing Chloe, he is hurt that his friend didn’t share the news and retaliates by starting up a rousing game of "Truth or Dare," that is meant to humiliate Kip into confessing to everyone. Meanwhile, Mack gets an unwelcome surprise when her ex-husband gives Buzz the night vision goggles she had planned to give him for his birthday. Cole comes to her aid to help re-think a perfect birthday gift and the two spend a carefree afternoon in town.
Mack prepares the camp for the annual CIT Parents' Weekend. Her hands are full with Zoe's high maintenance mother Bethany, and Buzz, who rebels against her punishment for the drinking incident on his birthday. Marina's flamboyant mother Crystal arrives unexpectedly at camp and drops the bombshell that things with her boyfriend are over and they now have nowhere to live. Kip's dad Larry hopes to spend some quality father-son time together but his over protectiveness becomes a problem when Cole recruits Kip's help outside Little Otter. Meanwhile, Roger inadvertently reveals Sarah's secret affair with Miguel and Kip has a health scare that ultimately reveals his battle with cancer to the group.
When the new mayor announces that he is performing same-sex marriage, Mack volunteers to host Raffi and Todd's wedding at the camp. While the camp staff prepares for the event, Roger tries to throw a bachelor party to attract more gays to Ridgefield. Meanwhile, Robbie's supporters ostracize Sarah after news of her cheating spreads, while Kip decides to pursue Marina, the woman he really wants.
Mack stresses over her parents’ arrival for the annual Harvest Moon Festival. Her larger-than-life father, Jack "Granddad" Jessup, decides to launch a prank war against Camp Ridgefield. Marina faces a pregnancy scare and Kip comes to her aid when Greg flakes. Meanwhile, Robbie spots Sarah over at Ridgefield and is disgusted to learn that she is now working for Roger.
The CITs prepare for their overnight on Bear Mountain, the final rite of passage before becoming certified Little Otter Counselors. Buzz plans for a big night of survival, bonding and losing his virginity. Chloe keeps interrupting Kip and Marina's alone time and the two decide to come clean to her about their relationship. Robbie encounters two French backpackers who take him on an interesting journey. Back at Little Otter, Mack discovers that Cole is considering a job with Roger at Ridgefield Alaska.
It's the final days at camp and Little Otter prepares for battle in the annual Inter-Camp Olympics against Ridgefield. Kip and Marina make the most of their waning time together, but the future of their relationship comes in jeopardy after Marina receives startling news about her mother. Cole and Roger make plans for Ridgefield Alaska, but their partnership is tested when Roger makes another play for Mack. Buzz faces off against his Ridgefield nemesis, Ryan. Sarah is determined to crush Ridgefield in the swimming event and when Robbie offers to join her team, their romance shows signs of revival.