First, if you're thinking Smithsonian, you'll be let down. This museum has four floors. The basement level is filled with a lot of dinosaur bones. If you're expecting T-Rex bones or long necks you will be disappointed, but there are PLENTY of bones to look at and the collection is quite nice actually. I went with our two youngest (3 and 4 years old) boys and the dino display was perfect in size. The second floor had a nice pterodon. The other floors had examples of texas wildlife (stuffed animals) and the top floor was way over the heads of little guys. BUT, the first three floors were pretty cool for them. So if you have a family with little guys, take them. They will enjoy floors 1-3. Parking in the San Jacinto garage is the way to go. We parked there and toured the museum and even visited the gift shop in about an hour. There is little to keep the attention of young kids but I found the museum to be a great place to spend time with my boys and teach them something. Price is great. FREE! Just be ready for a short visit since the place is small. If you have older kids who will actually read the displays, it maight take a little longer to get through the museum.
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