Green River UT is a good place to use as a base camp to explore the San Rafael Swell area and the Book Cliffs.
The San Rafael is runs both north and south of I-70. The Book Cliffs are on the north side of I-70 with interesting roads out of Thompson Springs
We always stay at the KOA, which we like.
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The Little Grand Canyon is in the north of the Swell , it can be reach from the lovely Buckhorn road.
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On the Buckhorn Wash road,
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The arch in the Eagle Canyon jeep road on the south.
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Sego Ghost town in the Book Cliffs
Ron