A nice little state park. There definitely are dinosaur prints in the pretty Paluxy River, though they're better marked at some locations than other, so in a few spots it can take a bit of effort to find them. The signage is also arranged with the assumption that everyone will drive from one set of tracks to the others, so if you instead hike along the river between sites, you then have to climb back up the rather steep riverbank to read the explanatory signs before going back down into streambed.
The park also has a very small visitors center that doesn't really do justice to the area's wealth of fossils, which ought to be one of the crown jewels of the Texas state parks system. I gathered that there are plans to build a much bigger and nicer visitors center/museum (they have an artist's rendering in the visitors center) but not sure if there's enough state funding for the park to do that any time in the near future.
There are also a couple of big -- life-size, actually -- kitschy fiberglass reproductions of dinosaurs from the '64 World's Fair at the park. They're scientifically quite inaccurate, but, to the park's credit, the signs are quite careful to explain that they're obsolete depictions and that they're of types of dinosaur that have no real connection to the park. Nonetheless, most kids will love 'em!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.