**NO PURCHASE OR CONTRIBUTION NECESSARY TO ENTER OR WIN. To enter without a donation, please mail a postcard to: National Park Foundation 2026 Adventure Awaits Sweepstakes, P.O. Box 9340, Medford, NY 11763-9340. All mail-in entries must be postmarked between 6/1/26 and 7/31/26 and received by 8/7/26. A purchase or contribution will not improve your chances of winning. The Adventure Awaits Sweepstakes is open to legal residents of the United States, who are 18 years or older at time of entry. Void in MT, WA, MN, and where prohibited by law. Sweepstakes begins at 12:01 AM ET on 6/1/26 & ends at 11:59 PM ET on 7/31/26. See Official Rules for details including alternate methods of entry. Sponsor: National Park Foundation. See Sponsor's privacy policy for details. See FAQ for more information.