I-44 to the Vinita Exit, turn left on Highway 69.
After you pass through the toll gate, turn right on Highway 85. Through BERNICE to Highway 125 (Lil' Offshore Convenience Store is a landmark)
Turn right and you are on your way to Monkey Island.
Port Duncan is about 4 and 1/2 miles from the convenience store.
From Kansas City:
Take Highway # 71 to Joplin (look for Alternate #71 to bypass Joplin) to Interstate 44.
Take #44 west to the Afton, OK Exit, then #59 south to #125.
#125 takes you right onto Monkey Island, at which time you will be approximately 4-1/2 miles from Port Duncan and Cliff Dwellings.
When you enter Port Duncan, stay on Port Duncan Blvd.; watch for Cliff Dwellings signs!