6. Boulder, CO
What makes this designation so great is that there are holiday-inspired events and festivals (fireworks, bike rodeo, Independence Day show…), as well as tons of other family-friendly activities to enjoy the rest of your stay. Check out the local farmers markets, musical festivals, canoe in the Boulder Creek, check out parades in downtown Boulder and take a free train ride on the Tebo Train for kids. Plus, Boulder is a big city, so there are tons of options of family-friendly places to stay and eat.