This is couple hiking over some rocks in a park of some sort.
The couple are swimming in a pool.
Hiking is not swimming.
exists p1 x1.(n_thing(x1) & exists s1 x2 x3 x4 x5.((x1 = x2) & over(x2,x3) & in(x3,x4) & of(x4,x5) & n_sort(x5) & n_park(x4) & n_rock(x3) & n_hiking(x2) & a_couple(s1) & Theme(s1,x2)))
exists e1 x1 x2.(n_couple(x1) & in(e1,x2) & n_pool(x2) & Actor(e1,x1) & v_swim(e1))