Replying to Longboarding vs Biking

Okay, I bike a lot(road biking) but I really want to get a longboard, because after riding my friend's I just couldn't get enough of it(almost as good as skiing but not quite.) I know I don't need it because I have a bike and all but the longboard just seems like t would be so fun to cruise around on and bomb hills. If I get one I'd have to go into my car insurance/gas money but I think I'll be able to manage seeing as they aren't the most expensive things in the world.
What do you guys think, is it worth it or should I just stick to biking? Thanks.