The Diner, Library, or Forest.

I think I'd pick Forest just to have a place to think without having to worry about losing time. Like if I really need to be alone and have restful sleep and delicious food, I can't beat that.

If I'm having a bad day or just want more sleep, I can find some fruit, read a book and return when I'm ready.

The Diner is cool because good food again and just meeting people. It would be cool to just watch the day go by while enjoying free food in a secluded booth. Or I sit at the counter and chat with people.

I like knowing things and the library seems cool. I just wish I had infinite time to enjoy it. I would procrastinate returning so hard if I find a good book.

Final decision - Forest.