by Lisa Trottier, Sunset senior editor
This weekend, June 20–21, is the first of three admission-free weekends planned for this summer at all the national parks. (Mark your calendars, the others are July 18–19 and August 15–16.) Some of the biggies aren't cheap, so clear your calendar and hop in the car.
Here's me enjoying Zion with the kids earlier this year. Price of admission that day: $25.

