Bar Harbor-sailing, shopping, whale watching, restaurants
Schoodic Peninsula
Acadia
Desert of Maine
Freeport-LL Bean flagship store plus outlet shopping (if you are into that)
Ogunquit/Wells/York area-beautiful beaches (but cold water), water parks, Nubble Lighthouse
Kennebunkport-shops, restaurants, Bush compound
Portland-sailing, shopping, whale watching, restaurants
Baxter State Park-canoe, kayak, hike
Bar Harbor KOA-pricey but beautiful locations. Sites are cozy. Incredible sunsets, lobster banks, pancake breakfasts