Every Sunday: Makauwahi Cave Tour. The richest fossil site in the Hawaiian islands is found east of Poipu at the Makauwahi Cave, an open ceiling sinkhole that is a uniquely preserved archaeological site. Considered a living museum, this 17-acre area serves to both interpret ancient history of Hawaiian plant, animal and human activity. Wear walking shoes, bring water. Makauwahi Reserve, 9 a.m. to 2 p.m. Donations are welcome. For information or reservations, call (808) 482-1059, or visit www.cavereserve.org.  Located in Maha`ulepu,…