Stuff to do with a friend?

So I have this friend and i liek talking to her but we mostly talk over gmail or text every once in awhile how can I find something fun we both like to do? Idk what she likes but what are some cool ideas we could do at or near my house? She doesn't like playing xbox and she might like biking but my bike is broken. Ideas? Sugestions? Also how can I tell when she is online because like is there an app that notifies you when someone comes on gmail? I am seriously like friend-crushing on her.