ogreplate,
If you take a little fossil guide with you it might make it a little less boring. You'll find many in any river bed or wash. Been taking the kiddos for years. We have a couple registered at SMU.
Also, watch the ranchers. It is always best to go to the big house to get permission. There are many mushroom gathers that look for specific kinds, and the good ole boys don't take to them well. They might just relieve you of your duties before asking what kind of mushrooms your looking for