Boys playing baseball by the water.
Kids playing together outside.
Since you find bodies of water outside then boys playing baseball by the water are kids playing together outside.
exists e1 x1 x2 x3 x4.(n_water(x4) & a_topic(x1) & by(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_baseball(x3) & (x1 = x2) & n_boy(x1))
exists e1 s1 s2 x1 x2.(a_topic(x1) & a_outside(s2) & Manner(e1,s2) & a_together(s1) & Manner(e1,s1) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_kid(x1))