Think about it - where else can you chill in an air-conditioned place, that's quiet, where you can read a cool mag or surf the net, where you can take a nap, check out movies, meet some friends for a game of chess or cards, read about whatever you like, get free bookmarks, talk to some fine librarians, walk around aimlessly, find out how glow-in-the-dark works..... and all for free!
Dude 2: "How about we go to the library?"
Dude 1: "Man that sounds boring."
Dude 2: "Seriously, just try it. I'll show you some cool stuff over there."
Dude 1: "OK... we'll see."
..............1 month later
Dude 1: "Hey man let's go to the library. Come on man get up."
Dude 2: "But we just came back from there 2 hours ago."
Dude 1: "Dude, that's a long time!"