HERO QUEST!
I got this for christmas when I was just a little kid, and I loved every second of it. It was literally the only boardgame that ever captured my attention for more than a few minutes, also allowing for the creation of your own little stories and adventures. Yeah, it is pretty similar to D&D, although it's alot simpler to understand and doesn't take for bloody ever to get into. It even had expansions. Lots of fun.