I just my mare out on a trail ride today (with about 25 other people) and loved it. Some people rode their horses through the lake to let them drink and cool off. At first my mare did not want to go, but I kept asking nicely. She tromped through the water like a pro. IT WAS SO COOL!!!!
My buddy that was with me, her horses does not like crossing water, except standing in the pond at home. (Any suggestions to get her in the water at the lake?)