Know Before You Go
Call first to see if there will be a docent on site. Just viewing the glyphs is great, but having someone explain the history and describe what you're seeing makes a more fulfilling experience.
The site is open year-round from 9 a.m.- 3 p.m., Monday through Friday. The site does close due to inclement weather. There are ample parking spaces, a visitor center, restrooms, and a small store on site. The walk back to the viewing area is an easy hike. However, the petroglyphs are not wheelchair accessible.
You'll be able to get within 10-12 feet of the drawings, so even a cell phone camera will be able to capture some decent images.