Grand Teton and Yellowstone National Parks are inviting visitors to celebrate the arrival of summer and discover the wonders of the natural world during “National Get Outdoors Day” Saturday. As an added bonus, entrance fees will be waived at the parks as part of an initiative to encourage people to visit, explore and enjoy America’s national parks. Fees will also be waived on three future occasions. Other fees, such as those for camping and boat permits will remain in effect. To further highlight National Get Outdoors Day and free entry, Grand Teton rangers encourage visitors to join them in family-oriented activities that focus on First Lady Michelle Obama’s “Let’s Move Outside” initiative which is a national campaign to end childhood obesity within a generation. Meanwhile, Yellowstone National Park Rangers advise that since Yellowstone is a high elevation park, visitors should bring sunscreen to protect themselves during the day, and warm clothing for nighttime temperatures that can drop to near freezing.