Free and cheap travel ideas for 2020

There's no reason to let your frequent flier miles disappear from lack of activity. Almost every program has either a dining miles or a shopping miles option, and with just one meal or small purchase, you can reset the clock for 18 months. Delta and JetBlue miles never expire, but most others require some type of activity every year and a half.

Travel doesn't have to be expensive with promotions from KOA Campgrounds. They offer Mother's Day, Father's Day and loyalty cardholder offers for free or discounted night stays. Some campgrounds have cabins, tee pees, tree houses and Airstream rentals.

The National Park Service offers a number of free admission days. Why not see America's treasures, and let Uncle Sam pick up the tab? There are five days in 2020 when you can do just that.