You're right, Punta Cana isn't an awesome location for diving. But I guarantee the water will be warmer than Gilboa this time of year, and any diving sounds better than sitting on the beach the whole time. If you're looking to get away for a quick dive or two to just go get wet, there is a Dressel Divers operation at the Iberostar resort about 10 minutes down the beach from where you're at with a decent boat and friendly DMs if you want to be back at your resort at a reasonable time. Their dive sites are prescheduled by time and day, but they will mix it up a little depending on conditions to try to find a dive site with better visibilty if the surf is high.
If you'd like a better quality dive, definitely look into Bayahibe options, but you'll be making a full day of it.