Too many vacations are ruined by sprained or strained or broken body parts because someone got a little too adventurous or tipsy. Take a quick spin. If you like to jog, take a run and you'll get a mini-sightseeing adventure. A run through the countryside is often a rewarding experience. Have a good chew.
Sightseeing Take a nap.
Then you're guaranteed to last through the rest of the day. Get some help. When arriving in a new city, head for the tourist office or visitors center and get a map and any other information that will help you find your way around. Find out what the locals are up to. The Web can be your friend.