I love that idea, unfortunately I can't water down the arena (it's not mine) but I suppose I might be able to draw a big circle. (any suggestions how?)
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Go to any sporting goods store and pick up a bunch of the little orange cones that soccer players use to mark their field for drills.
Measure and cut a rope to the radius of the circle you want to ride. To make it easy on your horse, make it a large radius. In the dressage world the standard large circle is 20 meters (66 feet) in diameter.
Have an assistant hold the rope in the middle of where your circle will be. You grab the other end and walk out until rope is taut. Then walk around your assistant all the way round the circle. If the arena is all chewed up, get a rake or drag and smooth it out so you can clearly see your footprints.
Then drop the cones along your footprints at regular intervals.
You now have a circle to ride.