The great thing about the outer cape, and Wellfleet in particular, is that it provides you opportunities to see what the outer cape was before people populated it. The great thing about this sanctuary's trails, all of which are well-maintained and easy to walk on, is that they show you so many different aspects of the outer cape - a freshwater pond, salt marsh, tidal flat, etc. Of course, along with this diversity of flora is lots of different fauna: red wing blackbirds, turtles, fiddler crabs, live horseshoe crabs, etc. (My son discovered that they have live horseshoe crabs by picking up by the "tail" one that he thought was dead. Of course, we would never knowingly pick up a live crab, but it was first one we'd ever seen that was alive. My son got quite a shock, but a thrilling one. Young kids may be impatient with the walk, unless they're carried, but they seem to perk right up when you finally get to the boardwalk and tidal flat, which you should get to at low tide. There is more to get out of the sanctuary that we weren't able to take advantage of - adult field classes, boat trips to see the seals, etc. (see their website!) - but I'm sure they are equally rewarding if not more so.