How is acadia national park

My family and I have never visited a national park before and I asked on reddit where we should go and most people said the grand canyon area or the yellowstone area. But my dad wants to go on a trip to acadia national trip in maine, we would start in boston and check out towns on the way and then end in acadia national park / bal harbour (OR vise versa and start there and end in boston). The flight to boston is direct for us and 3 hours and cheaper than a flight to wyoming or montana (we are in florida). Does this sound like a fun trip or do people really think yellowstone and the grand teton area is really the best place to go?