Shallow Water (4 ft) Aerobic Exercises?

I am going to be getting regular access to an above ground pool that is 24 foot in diameter (pretty big) and 4 ft deep. I know I can swim around in circles, but I wonder if there are specific water exercises I could do, even though it's only 4 ft deep. (I'm 5ft 8.) I've never done any water exercise except swim, so I don't really even know what I'm asking. Any info, regardless how basic (for instance - is it worth anything to walk around? Hop around? Use arms but not legs? etc)will be appreciated! Thanks! Oh - I should say, my doctor wants me to swim because of ankle and knee pain I experience with extended walking. I do love the water.

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