My mom got this for my daughter for her second birthday.  We put river rocks in one side and water in the other, which is just perfect!  My only complaint is that the sand side doesn't have a drain, even though it's sure to get water in it.  We had water on both sides for a while, which she loved, but I had to tip the whole thing over to drain it.  Not a big deal.  All in all, a great toy for summer!