Make some time this summer to go camping. If you don't have the gear or can't devote an entire weekend, pack a picnic lunch and get up to the mountains or over to that lake. Spend a day hiking or relaxing while you listen to that unique sound the wind makes when it blows through the trees.
Take in a ball game. Nothing is quite the same as listening to the crack of a wooden bat as the crowd cheers for the home team. Can't get to a big league park? Support your local minor league team. Even the single A games are pretty impressive to watch. And the antics of the mascots make the breaks between innings as entertaining as the game itself.
Get to the beach if you can. It's a wonderful way to spend a day. The sound of the waves rolling in is soothing and I never cease to be amazed by the sheer power of the ocean. Feel the warmth of the sand under your feet and the cool refreshing splash of the salt water as a big wave catches you by surprise.
Have a great summer!