Two middle-aged men walking on the beach.
Middle-aged men are on vacation.
That the two middle-aged men are on vacation as opposed to some other reason to be on the beach cannot be inferred from sentence 1.
exists e1 s1 x1 x2 x3.(n_beach(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_man(x1) & a_middle-aged(s1) & Theme(s1,x1) & card_eq_2(x1))
exists p1 s1 x1.(exists x2.(on(x1,x2) & n_vacation(x2)) & n_man(x1) & a_middle-aged(s1) & Theme(s1,x1))