The Minecraft Minigames (BETA)
Website Link: http://theminecraftminigames.webs.com/
There are lots of minigames to play, lots of items to buy, lots of rollercoasters to ride, lots of prizes to win, etc.
The server is not online 24/7, but it is online sometimes.
Good luck :D.
Special Thanks For The BETA Players: potaot, dragondude87, cynaidh, and tommiewool. And The Admins Who Helped Me Out: AngelNOfficial, Animekey, TheMuhCow.