Tennis or hiking? Definitely choose tennis! It is great for fitness, flexibility, agility and speed. It is a great aerobic activity while also being able to engage socially. Invite your neighbor for a game of tennis this long weekend.
If you are having problems with your backhand, look for a pro who is willing to spend the time correcting your technique. Try the TennFitt Tennis where you will correct your backhand technique by playing against the wall.