Visiting Paia, Maui in Feb. 2008. Have 4 & 2 yr.olds.What outdoor activities do you suggest?

are there easy hikes to waterfalls? Best family luau to attend? will also drive to destinations, but our rental house is in Paia.I'm looking for visual activities for our youngsters. With 3 little ones (also will have a 10 month old) we will not be doing a big night life, but am searching for a few day activities with the kids.