Probably not worth 1.5 hour drive, but that may depend on what other options you have near you. For just a test drive, it might be fine. I think the only trails open to 4x4's are trail 1 and 8, but it has been many years since I have been there on a dirt bike.
I enjoy it. Ran it last year in the power wagon and it was much more rutted and rocky than i remembered from the xj run a few years back. Nothing difficult but still fun.