I've visited this boardwalk for years, and at all times of the year, and it never disappoints. It never gets old reading the planks as you walk along the dunes and over the little waterways! (Although I cringe to think of falling into the deep dark muck on either side, because I'm not sure how you'd ever get out! :) )
The parking areas are rather small, but this keeps the crowds down, and you cannot beat the price, since it's free! You can explore the waterways at low tide, and it's a perfect place to canoe/kayak at high tide -- you can catch crabs from the bridge, and see plenty of birds, horseshoe crabs and more along the way. The beach end is a clear, but rocky beach -- just off of the Cape Cod Canal, so it makes for some really great boat-watching too! Pack a picnic and bring some sunblock (you'll be hard-pressed to find any shade anywhere nearby) and just enjoy a few fantastic peaceful hours here!
When we visited over Fourth of July weekend, there was even a gentleman singing Frank Sinatra tunes out of the back of his truck -- with speakers, etc -- a little quirkly touch I hadn't experienced before! :)
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.