I've noticed there are TONS of weird books and crannies all over the maps, cool places to hang out in if you can get there, but there's no real purpose for them. It has occurred to me however that these places would be most excellent for Hide and Seek. All that would need be done is an option to turn off seeing where people are on radar and the names removed from over the head. I'm sure it would still be a bit of work, but I like to think that it would be something a lot of people would have a lot of fun with.