I also tried to teach him to float--he sank like a stone! I tried to do like my mom did and hold my arms under his back while encouraging him to fill his lungs with air and make his body light. He still sunk!
Funny! Same thing with my guy! Great swimmer but couldn't float! I'm a great floater...so-so swimmer and after 6 trips have gotten him to float a little better.

Loving your trip report! Keep it coming!