We recently took our four kids (ages 7,5,3,2) and adult visitors from the midwest for a day trip. Our expectations were modest given it is a state park and as everyone knows our parks systems have very constrained budgets right now.
To sum it up - everyone had a blast. We went on a 105 F degree in mid-August. We all wore swimsuits under our clothing and brought plenty of drinking water and sun block.
The river was low and there were tracks, especially at site #2, that were grouped together with no water covering them. At site #1 there tracks visible but under about 6 inches of water alongside the "swimming hole".
After checking out the tracks and reading the signage we did some hiking up and down the river bank and took a swim in the swimming hole area.
As others have noted - I agree:
#1 - this is NOT a protected archaelogical site. It is a state park where you can explore and touch the dinosaur track remnants. If you go with these expectations you won't be disappointed.
#2 - Hazards - the rocks in the river are very slippery. To see many of the best tracks you have to at least hop across rocks to get to them. We saw many visitors in cowboy boots, dresses and attire not appropriate. Swimsuits, sandals/pool shoes and shorts/shirst are best.
#3 - Sunblock/Bug spray good to have - in the summer the sun reflecting off the river is instense. We also experienced some biting flys.
#4 - Glen Rose is a major speed trap - we came through town from DFW, returned at lunch and passed through again in evening. Every time we witnessed Glen Rose officers pulling people over on the main highway issuing tickets - Watch Out!