Our pontoon boats do not have bathrooms on board. You are more than welcome to come back to the docks to use the restroom or there is a public restroom in Joe's Bayou at the boat launch.
The one we had did not. You can pull up to restaurants and crab island and I think they might.
Get quick answers from Luther's Pontoon, Waverunner, & Kayak Rentals staff and past visitors.