Acadia National Park just outside of Bar Harbor, Maine, is one of those places where it is somewhat tricky in figuring out how much time you need to explore and truly do the park justice.
On one hand, with great weather and the north's long summer days, you can hike an incredible amount of trails within the park in just a single day. We hit it so hard on our first day there that if you told me had to leave I would've been more than content. We really saw a great cross-section of the park in a short period of time. On the other hand, frequent rain, solid crowds in prime months, and the nearly four-hour drive from Portland add on some considerations that may make you want to extend your stay.
We ultimately settled on four nights in Bar Harbor and felt this was the perfect amount of time to really explore Acadia National Park and the region at large.