A large group of people wearing similar clothing riding a single vehicle.
The people are all traveling together for a vacation.
People traveling together does not mean they are on vacation together.  The group could be bicycle marathoners.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6.(a_topic(x1) & of(x1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_wear(e2) & Theme(e1,x6) & Actor(e1,x5) & v_ride(e1) & n_vehicle(x6) & a_single(s3) & Theme(s3,x6) & (x4 = x5) & n_clothing(x4) & a_similar(s2) & Theme(s2,x4) & (x2 = x3) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2.(n_people(x1) & a_all(s2) & Manner(e1,s2) & for(e1,x2) & n_vacation(x2) & a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_travel(e1))