Aww, you are so lucky! What does your gut say? Just listen to that! But if you do say no, make sure you don't do it in front of a bunch of his friends :( But you don't really know him though, right? Get to know him first!
Also, I'm not really sure what he would do as a "boyfriend"- sure, dates under the slide are cool, but he couldn't really take you out, and nothing could ever get "serious." Oh, if your school has dances, go with him to that!!
Hope that helps! Thanks for your nice comment earlier today, by the way :) Made my day even brighter!