We have a couple of small lakes within riding distance from my Dad's house (25 miles) that I regularly go to in the summer. Though one of them was drained a few years ago and isn't filled back up yet. The other one is gorgeous and fed by an artesian well. It is just the right depth to ride your horse through cause it gets to about 15hh deep with just a few deep spots. Love it and I am looking forward to summer just for that reason.
That foal is absolutely adorable and I wish I were closer. I would take him in a heartbeat but I am sure that there are good homes a lot closer to where you are so I wish you luck in finding him one.