A very easy 4x4 road, and probably on your route to Moab¡ west of Monticello, is a wonderful peak, and you and your group can camp in many places along the road¡
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Abajo Peak, W7U/SU-014
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Near Moab, very near Dead Horse Point:? The Knoll W7U/GR-031 you and your wife can easily do it
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Island in the Sky: Aztec Butte: W7U/SU-058 again you and your wife can easily do it, and the views are terrific.
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All of that said, if you haven¡¯t already, research ¡°The White Rim Trail.¡±? Not (usually) a difficult 4x4 trek, should do an overnight somewhere along it, like driving through the Grand Canyon.?