Hershey is over. They should all be home.
There is a whale watching company in Bar Harbor that is worth a look.
http://www.barharborwhales.com/ They have a store right on the waterfront so there is probably someone there most days that could answer questions if you call them. We went out with them and had a great time. One item we noted is that they tell you pretty early on the tour that a certain type of dolphin is actually a whale (thus getting you the guaranteed whale sighting). We did see several other types of whales but that was in the summer. I see from their site that they are getting sightings now. We did the puffin and whale tour so it included a "visit" to sit offshore of an island with lots of puffins on it and we watched them for a bit. Take binoculars if you have them. I don't know the season for the puffin either but the cruise company can answer all those questions.
I also recommend Diver Ed tours
http://divered.com/ - for another time. I checked their website and they only run Memorial Day through Labor Day. Store this away for future reference though. The tour we went on was more kid oriented (though we, as adults, had a blast and saw lots of critters). Acadia teamed with them and offered a Ranger Led tour that went more down the coast and was more likely to see whales and covered the park from the ocean but also included the usual diving stuff with Ed and Captain Evil (his wife). I don't know if this runs off season or not (Ed is a scallop fisherman in the winter and dives for those). Once in place on the water, Diver Ed goes down in the full dive suit with helmet and video camera. You sit topside and watch the video feed as he finds and brings up sea creatures. You can hear Ed and Captain Evil narrates and talks with the passengers. Ed brings up sea stars, lobsters, urchins, etc. and puts them in a touch tank where the passengers and check them out... and kiss them if desired.
Take water shoes that grip rocks. Acadia has so many areas you can rock scramble and check tide pools and the BAR in bar harbor is walkable at low tide (driveable even for some people). You can cross over to Bar Island and do a hike there. Just make sure you are back before the tide rolls back in. Check at the Acadia visitor center for the best times to hit the different locations around the island. Thunder Hole is unimpressive until the tide is blasting in THEN you get the water booming into the crevice and shooting into the air. The carriage roads are great for hiking and biking and all those gorgeous stone bridges are different and named. Again, the map is at the visitor center. They have so many different brochures that you kind of have to know what to ask for - or keep going back like we did.
So much to see and do in the White Mountains AND at Acadia. If you like food and your route takes you nearby, stop at the King Arthur Flour factory. They have a nice store, dining area and you can watch them bake through large glass windows. We went two or three times when we were in the area. I was wishing there was room in one of their classes for Chloe and me, but no such luck. If you want to get into a class, check the schedule now.
http://www.kingarthurflour.com/visit/ We stayed at the Queechee KOA and visited Queechee Gorge, Marsh - Billings - Rockefeller National Historical Park and Billings Farm, VT, as well as Saint-Gaudens National Historic Site, NH. We then stayed at Crawford Notch State Park and went up Mount Washington.
If you are into baseball, we stayed at Glimmerglass State Park which is near Cooperstown and the baseball museum (which we didn't hit).
Lots of wondrous things to see and do. Enjoy the trip!
