$8.00 for adults and $5.00 charged ( even for my 13 yr old daughter). Staff very friendly. Spectacular views from top observatory. Grounds pretty well kept. Had some birds in cages, gift shop, restaraunt, free sample of rum punch or water. We went as St. Peter's is directly across the street from Tree Limin zip line. That way, you can do two activities in one excursion.
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St. Peter Great House