There are miles of marked hiking trails. Both on the marked trails and off, beaten paths have been created in certain areas by horny gay men. People cruise each other, talk, meet, take walks, play there. Sometimes they go other places to have privacy. Sometimes you see condom packages and condoms, a pair of underwear, or a porn magazine.
Condoms indicate that maybe people are fucking in the woods.
I've seen plenty of blow jobs. It's not unlike any outdoor cruising area anywhere. Bars used to be my prime place to meet new sexual partners. An ear condition I have makes it uncomfortable for me to go to loud bars, so my carousing has decreased. I'm not entirely displeased with not going out to bars as much.