The competition pool at Sydney Olympic Park Aquatic Centre
You're a water lover, otherwise you would not have stumbled across this question in the first place. Do you love the achievement of swimming laps? Or the adrenalin rush when diving from a 10-metre spring board instead? When you do swim, you might also prefer swimming in a specific lane.
Swimming! Diving is fun but is more high risk, so you really have to concentrate to do it safely. A leisurely swim is the safer option, unless you accidentally swim in the fast or slow lane when you're moving at the opposite speed :S