Where is the adventure date? What - no ziplining or parasailing or...maybe these aren't offered on the island. Anyway from positioning, it would seem as though Tenley is in the F1 spot - 2nd date; while Gia is in the F3 spot - 1st date. Then again, canoodling on a pirate ship and imitating a classic movie as the waves at sunset wash over them. Vienna seems to be getting the most romantic date.
Gia - power skiff to a market
Tenley - helicopter to a rain forest and sugar plantation (are they going for education this go around?)
Vienna - make out sessions on a pirate ship and a sunset beach
From these descriptions, I would say that yes, Vienna is F1. But, they will do whatever they can to make sure Tenley appears to be in the running.