I got this:
https://gopro.com/en/us/shop/mounts/...B&gclsrc=aw.ds
I stick the handle in the front jacket pocket and the camera sits just under shoulder level. I bungee the wrist handle to the a strap on my vest. It's nice because I can unfold it into different angles and get some cool shots when dolphins/porpoise/sea lions or something comes by. It's also easier to clean than the extendable poles since it doesn't trap water inside. It's a little more bulky than something like a strap/clip, but the trade-off for versatility is worth it to me. Haven't actually edited anything together yet to show, but maybe eventually I will lol