Naively the wife and I entered this park not knowing just what to expect and ended up disappointed as we could've just drove in without paying the $5 entrance fee and stopping in at the Visitor's Center where we should've asked the question, "Is the Observatory open?" We then could've paid the entrance fee if it had been. Well it wasn't open in the middle of the very hot afternoon so we just had the sand dunes to enjoy in approximately 100 degrees weather (7 degrees humidity! Having grown up around the Indiana Dunes on Lake Michigan these were quite a bit bigger, but not worth the trip in the summer to see without something else like the observatory to enjoy. Frankly you can see many of these same dunes outside the Park in and around the immediate Bruneau area without any charge.
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