Young naturalists: Come muddle in the marsh with Mashomack Preserve from 10:30 a.m. to noon. Why do salt marshes smell like rotten eggs? Discover the wonders of this habitat and why it’s called the nursery of the sea. With clam rakes and seine and crab nets guests will find marine creatures and have fun. Come ready to get wet. Ages 4 and up. (631) 749-1001.