Dungeons and Dragons only, preferably 3.5 Edition. I've been playing D&D for 28 years, I've played almost all worlds of D&D including Forgotten Realms, Greyhawk, Dragonlance (started playing D&D on Krynn in '83 when DL1 came out so I have a soft spot for DL). I have only played Eberron on Dungeons & Dragons Online.
"If riding in an airplane is flying, then riding in a boat is swimming. If you want to experience the element, then get out of the vehicle...SKYDIVE!"