The Oklahoma Department of Tourism offers a free guide to their 50 state parks. The handy table of contents allows users to easily find state parks with lodges or cabins. There is also a location key to find state parks in any area of the state.
The 33 page guide lists each state park, along with a brief description, its location and contact information. Plus the amenities and activities available at each state park is listed. 
One thing I really like about the guide is that it also lists attractions near most of the parks that visitors may want to check out.
To get your free copy, click here to go to the official Oklahoma tourism website.
Minnesota, the land of seemingly endless lakes, has lots to offer outdoor enthusiasts. Plus, they offer free literature to help people decide where to go and what to do. The ExploreMinnesota website has a free brochures section where you can order, free of charge, any of the following publications: Spring/Summer Minnesota Explorer, A Guide To Minnesota’s Boundry Waters Canoe Area Wilderness, Minnesota Wildlife, Minnesota Fishing Guide, Minnesota Highway Map, Explore Minnesota Biking, Explore Minnesota Golf, Explore Minnesota Travel Guide, and Explore Minnesota Byways. There’s something for everyone. 
While on the Explore Minnesota website, enter their “Summer of Fun Giveaway,” for a chance to win a two year Toyota Hybrid Lease, an Arctic Cat 700 H1 ATV, a Specialized Mountain Bike, or a Minnesota Vacation Giveaway. There are also weekly prizes, so enter every week for more chances to win some fun summer stuff.
The free Maine Camping Guide is available in electronic format or by mail.
Click here to view the electronic version of the Maine Camping Guide.
If you prefer to hold the guide in your hands and take a leisurely look at it while lounging in your favorite easy chair, click here to order the printed version.
The guide breaks the state down into 8 camping regions: South Coast, Western Lakes & Mountians, Kennebec Valley/Moose River Valley, Mid-Coast, Cowneast/Acadia, Sunrise County/Downeast, Aroostook, and Katahdin/Moosehead/Highlands. 
There are 225 campgrounds listed in the guide from small campgrounds, to mid-size campgrounds, to large resort campgrounds.
The diveristy in the state’s geography means you can camp near the ocean, in the middle of a forest, or by the mountains.
It’s a handy guide with tips on where to go and what to see while staying in Maine.