13. Great Wolf Lodge

Location: Grand Mound, WA

Great Wolf Lodge has 11 locations around the U.S., but the location in Grand Mound has two special attractions worth shouting about. The first is Fort Mackenzie, a four-story tree-house/water fort. Aside from sounding like the most dangerous thing ever created, it also seems amazingly fun. The other is the Howling Tornado, which is the world’s first totally enclosed multi-rider Tornado tube ride. And yes, that apparently is a legitimate distinction to make.