Look at the national parks, ie. bryce canyon, zions, ect.. If you take state road 6 almost to Spanish Fork there is some good riding there. I forget the name of the place but you can't miss it. Good luck.
You could go to Sand Mountain in the Eureka/Delta area. You can ride and camp in the dunes or continue past the main mountain (north end) on the access road and camp to the west of the dunes in the cedar trees. Lots of trail riding out toward Cherry Creek resevoir ect. and you still have access to the dunes. They runs some big cross country races there every summer.
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