National parks in the USA, each state puts aside an area to preserve for future generations. I always get the annual pass for the state parks because I want to support them. In addition, I visit these parks very often so in the long run it saves money.
The best way I have found to photograph these wonderful places is to get off the road and explore the hiking trails they offer. I usually am there early in the morning and late afternoon where the lighting is best. Also, the wildlife is generally out and about more that time of day.