National Park Week starts Saturday! For one week there will be special events at many of the 394 national parks in the United States. Plus, admission is free at all parks!

We’ve teamed up with our friends at National Geographic for a new item and giveaway. Check in at a national or state park in the United States this month and you might receive a discounted subscription offer for National Geographic Magazine! Over the years, National Geographic has inspired us and millions more to explore the world around us.

To help celebrate National Park Week, we’ve created beautiful stamps for some of the most spectacular parks: Yosemite National Park, Yellowstone, Alaska’s Denali National Park, the Great Smoky Mountains, Rocky Mountain National Park, and Arches National Park in Utah.

We’ve also added a brand-new pin! Visit three state or national parks with Gowalla anywhere in the world and you’ll receive this great Trail Guide pin. Going out and discovering nature’s wonders is a big part of what Gowalla is all about. Whether a quick day-trip or a week camping under the stars, hiking or biking, skiing or swimming, there’s nothing quite like it. Make plans to go out this weekend!

To find out more about National Park Week, including how you can get involved and help out, visit the National Park Service and National Geographic’s National Parks guide.