I'd say hiking because it's the most secluded option of the 3 so low chance of distractions, also we might encounter a shrine which could give us some clue of what's going on.
@Undorian You see ascending a mountain occasionally in manga, but hiking in general is a bit rare, so it would be cool (even if it's not as hardcore as in The Fable). I'm sure the twitter folks will choose the beach, though.
can't turn her down anymore uh oh
not sure if it's because they're sleeping ass to ass and its considered rude to deny someone in that situation or spooky yandere cloud got its claws in the poor lad