Rocky Mountain National Park is 415 square miles of mountains tucked between Estes Park and Grand Lake. It has more than 300 miles of hiking trails.
Directions: From the east, drive down Interstate 25, take U.S. Highway 34 or 36. From the west, take Interstate 70 to U.S. Highway 40 to Granby to U.S. Highway 34 to Grand Lake.
Hours: Open 24/7. (If you arrive early before staff is at the gate, they may ask you to pay on your way out.) The Beaver Meadows Visitor Center is open from 9 a.m. to 4:30 p.m. Sunday through Saturday.
Fees: $25 for a day pass, $35 for a seven-day vehicle pass, $30 for a seven-day motorcycle pass, $20 for a seven-day pedestrian or bicyclist pass.