Hitting a small furry ball back and forth over a waist high net causing the opponent to run all over the place trying to catch the ball in the racket and hit the ball back.
The tennis courts have given way to a lovely park area with promenade.
However, The Hotel Del offers boating, surfing--lessons too--and golf for it's guests. So there are plenty of sports activity to choose from.
Equipment: A racket and energy.
For all their sports, you can rent the equipment needed.
I watched a few people with surf boards coming into water at the Coronado Beach but in a minute lifeguards asked them by car's loudspeakers to go out of the water.
Is surfing forbidden there? I think so.
From Ferrylanding dock I watched many yachts sailing in San Diego Bay. I wonder: do they owe them or rent them?