People are doing various activities on the beach.
People are in a pool.
People on the beach are not in water while being in a pool is immersion in water.
exists e1 s1 x1 x2 x3.(n_beach(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_activity(x2) & a_various(s1) & Theme(s1,x2) & n_people(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_pool(x2)) & n_people(x1))