The coastal islands are full of mosquitos and unless there is a nice constant breeze blowing, you're going to get eat up. One insect that isn't shy of anything, short of a strong hand slapping it, is the yellow or deer fly. These biting insects don't announce their presence until they've started to bite. You don't really feel them lighting on your exposed skin. But they sure do hurt, and a lot of times, the hand is too late to slap them dead as they've already gotten their little micro meal and flown off.
We also lots of the usual crab tracks and holes of the ghost crabs. These nocturnal crabs will dig holes that bely their size, so you will see different sized holes along the dune lines.