On a family vacation with aunt, uncle, and two cousins who aren't even teenagers yet, so I'm feeling sort of alone of course because I'm not here with any friends my age and no girlfriend. I enjoy the things I'll do with them...golf, the beach, the boardwalk, etc. but I'm looking for crazy/fun things to do maybe by myself to toughen up and push myself to some limits mentally and physically. Any ideas? In an east coast beach town.