Americans kicking off summer at national parks and U.S. Forest Service trailheads this Memorial Day weekend will find clean restrooms, well-staffed visitor centers and tidy trails. But longtime public lands advocates say it's only a matter of time before campers,

Millions of Americans are expected to travel this weekend, and it's likely you'll run into at least a few at a national park near you.

Trail Ridge Road is not anticipated to open over the Memorial Day holiday weekend, the National Park Service said in a news release.