Players have been asking for a beach to be added to the game for a long time;
I just took a look at the game's "official" website and it mentions a kind of lake on campus and possible activities there, which are:
Sunbathe, swim, socialize, skinny dip, and even a fishing minigame! Who knows, maybe we can play volleyball on the sand too... Like, seriously, the gym pool is the most boring thing I've ever seen (No offense intended).
I really hope the developers take this idea forward.
So, developers, PLEASE add a real beach or lake to the game.