To be fair, there is slightly more than that. There will be a series of displays that have information about the Manhattan Project. Normally, there's also some displays with a small amount of trinitite. That said, yes, there's not much there, which was partly why it was a good spot for the test. The Nuclear Museum on Eubank in Albuquerque has far more information about the project in case anyone is interested.
By the way, if you head east on 380 through the Valley of Fires, there was a soda fountain in Carrizozo where the proprietor was a little boy when the test went off. He remembers the blast, which could be heard from the city. I just did a quick check and it may be closed now. He was getting up in age and it'd be sad if he passed.
The series of displays aren't historical objects (with, I guess, the exception of trinitite), they are just a poor method of giving very basic background info. Time would be better spent reading Wikipedia.
By the way, if you head east on 380 through the Valley of Fires, there was a soda fountain in Carrizozo where the proprietor was a little boy when the test went off. He remembers the blast, which could be heard from the city. I just did a quick check and it may be closed now. He was getting up in age and it'd be sad if he passed.