I would like to visit a state park with my kallah for walking/hiking light trails. The trails often have foot traffic, but it is likely that we would be out of eyeshot from others at some points during the walk. Is this permitted?
You can go to a state park, however you have to stay in places that there are people frequent and there are people passing by every ten minutes, and they will be able to see both of you. Otherwise it is yichud.
Toras Hayichud 4-4,6,14.