Sutton Mountain Wilderness Area has some hiking opportunities in that range. Also, Blue Basin has a short and long hike that are both spectacular, although the long hike may be less than 5 miles. Check in at the Thomas Condon Paleo Center and they can give you information on some great hikes inside the monuments. For more information about hiking Sutton Mountain, check in with ONDA.
I also recommend the moderate longer hike around blue basin
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