Scuba diving is without a doubt one of the coolest things I have ever done.  To be honest, I never thought I would actually try it.  Not because I wasn't interested (I was very interested!), but because it felt like an inaccessible hobby.  Between the expensive equipment and expensive training, it felt like too large of an investment for something I'd never done and wasn't even sure I would like, right?  If only there were some way I could try diving first, before committing to it...