Most popular places in Maine:
Old Orchard Beach: A very popular destination in the summer and plenty of campgrounds to choose from. Six mile long sandy beach. While there, take an afternoon and go to Fort William in Cape Elizabeth..... Beautiful lighthouse, nice trail by the ocean, picnic area etc etc. Old Orchard is also less than 10 miles from Portland and it's Old Port and cobblestone street. Always something to do there.
Going north, you'll find three quaint towns: Camden, Boothbay Harbor and Bar Harbor. All three have a lot of little shops, restaurants and they are all situated by the ocean or a bay. If ever Camden is on your agenda, consider Camden Hills State Park Campground. Very woodsy and beautiful.
Bar Harbor is home of the most popular tourist place in Maine: Acadia National Park. The second most visited National Park in the USA. If you're an outdoor person, you could stay weeks there and always find something to do.
Finally, Baxter State Park..... and this is really if you're into nature and mountain (Mt Katadin). Not much there other than the park.
WELCOME to MAINE