Natives are taking a group of tourists out on the river for a tour of the wildlife.
2nd generation Americans are showing their families around the native land.
Natives are taking a group of tourists out on the river are not Americans showing their families around the native land as tourists are not family and a river is not land.
exists e1 x1 x2 x3 x4 x5 x6.(n_wildlife(x6) & n_river(x4) & on(e1,x4) & for(x4,x5) & of(x5,x6) & n_tour(x5) & r_out(e1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & of(x2,x3) & n_tourist(x3) & n_group(x2) & n_native(x1))
exists e1 s1 s2 x1 x2 x3 x4.(n_land(x4) & a_native(s2) & Theme(s2,x4) & around(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_show(e1) & n_family(x3) & of(x3,x1) & n_thing(x1) & n_american(x1) & of(x1,x2) & n_generation(x2) & a_2nd(s1) & Theme(s1,x1))