Get outside and learn an old/new skill for the summer! All you need is a good compass and a topographic map.
Yes, I know–the GPS in your phone does all that. But the U.S. Navy is once again requiring their officers learn to navigate the old fashioned way! Think about it…the batteries don’t die & you are never out of signal range.
Hiking or walking, whether in a city or a National Park is great exercise and you can take your best 4-footed friend too!