The PFD pictured doesn't have D-ring harness attachments. I would recommend getting the ones with the D-ring, that way you can attach yourself to a tether which is then attached to the boat.
Deluxe Inflatable PFD with Hydrostatic Inflator Technology (HIT) and Sailing Harness MD3184
As far as a tether goes, it is safer to get one with a snap shackle that can be released under load (in case the boat goes down or flips over) and a fail-safe snap hook. Personally, I prefer the Kong style since the snap hook is easy to operate.
Kong Single Retractable Tether
First rule - stay on the boat.