Nah. I see Charli as the beach type -- volleyball, boogie boards and maybe even a run by the ocean.
As for Marita and Bets, their agenda would depend on who was on the trip. Is it a girls' weekend or are they there with Charli? The days would be much the same either way, spent on the beach, preferably close to a lifeguard stand where they could scope out those in charge of keeping them safe -- purely a precautionary measure, of course, especially once Marita realizes the lifeguards are closer to Charli's age than hers. Talk about a reality check!
Bets' swimsuit of choice would be a bikini, of course, accessorized by a big hat and little-to-the-imagination cover-up. She'd skip the cover-up completely if it didn't complete the ensemble with the hat (protecting her fair skin) and all.
It's always fun imagining what my characters are doing outside the pages of the book, especially when I'm at work on another book they populate, as I am with Marita, Angel, Bets and Charli.
Genevieve, a character I'm in the midst of creating now for a book that won't get written for quite some time, is significantly older than Marita and Bets. She would grace the beach only in the early morning if at all, settling under an umbrella with a cup of coffee made from beans she ground herself. In her current incarnation, Genevieve is reclaiming the beach, a place she has assiduously avoided for decades.
Dressed in a classic black one piece.