Legoland
This park is proof that you can never be too old for legos. My favorite part of this park is the Miniland section, which is lego recreations of famous cities and other landmarks. Washington DC was just amazing to look at. On the same token, they have a section that recreates all of the scenes from the various Star Wars movie, which is awesome to the nerd in me. This park is special in that many of the rides and activities are geared for the entire family and not just one rider, which is great.