I built a walker for John out of PVC pipe that was much easier for him to maneuver than the traditional aluminum walkers.  I admit, the aluminum walkers are very sturdy – much more sturdy than the PVC walker, but because of that they are heavy and difficult for a child with low tone to move around.
John was able to use the walker at the beach, and swimming pool.  Plus he could get around in the house more easily, too.