Your best bet with GPPA claims (in my opinion) are those in northern AZ. It’s pretty much impossible to not end up with at least a flake from hitting those gold fields. From Las Vegas, they are about a 2-3 hour drive.
Crimson Dove claim in Utah is quite a bit more of a drive (about 4 hours from Las Vegas), but if you are looking to pan/sluice, it might be one of the closest options. Absolutely beautiful space.
If you wanted to join a local club, Gold Searchers of Southern Nevada has several claims in northern AZ, as well as a claim in the Johnnie District by Pahrump. They are having a monthly outing next weekend at one of their AZ claims.