Acadia turned out to be one of our favorite parks. We visited during the last week of October for our first wedding anniversary. Both of the New England cities we visited were very enjoyable and quaint - but Acadia definitely stole the show.
Must see - Sunrise on Cadillac Mountain
Must do - Walk along the rocky Acadia shoreline - (with caution!), climb the Beehive Trail - (again...with caution). If you visit Portsmouth - Halloween is a good time to drop by.
Must eat - The Oar House in Portsmouth. Pricey, but definitely worth it.
Must drink - If you're there around fall time, definitely seek out Shipyard's Pumpkinhead Ale. Best pumpkin beer we've been able to find!
After the fog lifted a bit, we explored Sand Beach for a while and saw some deer roaming the grass behind the beach. We took the short hike around Great Head which offers some beautiful ocean views. We then headed down park loop road a bit, stopping for a quick look at Thunder Hole (at which I received a very cold and wet greeting observed in the photo below).
After we exhausted our motivation for exploring and our stomachs were empty, we headed to Bar Harbor, which is a must-stop if you are spending time in Acadia. It's a great (touristy, but great) New England small harbor town. We steered clear of the fine dining and chose to eat at Geddy's Pub which was a perfectly relaxed atmosphere after our long day and provided an excellent selection of alcoholic beverages.