Bad idea.
First and foremost: It is cheaper and more fun to simply hire a driver for the day or a taxi for a dinner-out trip.
The roads suck. At night, they are horrific. At night when it rains (and what's the chances of that?), the are terrifying. Have you ever driven in such a situation? Until you do, there is no imagining what little effect the high beams will have, supposing that they work or are aimed correctly in the first place.
There are no reflectors anywhere, and it is a target rich environment. The "invisible pedestrian" is apparently the national costume of Honduras.
Trauma center? Be serious. No ambulance of any real life support style that you take for granted, and the hospitals are set up to take care of what they can. This isn't Houston.
If you injure a Honduran, you will support them forever. If they hop into or onto your vehicle uninvited, you still are liable. Chickens, much less island dogs that no-one before laid claim to, can gain immeasurable value if you flatten one of them.
Transito, the vehicle police (Honduran law enforcemnt is like a salad, it has seven layers), will flag you down in a rental vehicle just as assuredly as a local. Your paperwork (for any vehicle) simply can never be in proper order. It is a fact of life.
There is very little to see or do on Roatan that can not be accomplished in 1 day, usualy the day before you fly, anyway. Get on the arranged tour and go over to see Flipper interact with you and the cruise ship types at AKR. Do the Jungle Canopy slide-for-life Tour, some meager shopping (mostly Guatemalan imports) in West End and Coxen Hole.
The true adventurers might hire a driver to go to Oak Ridge and do the Water Taxi tour through the mangroves. This is good if you like beer!
Other possibilities include the Iguana Farm, Boanical Gardens, Horseback Riding and... I foget what else.
There are three restaurants of note on Roatan that I am aware of. Two are in West End (Garden of Eatin & The Argentine Grille), about 25 mins by cab, and just East of FIBR (a quick cab ride) to The View. Other than that, you have Gio's and Remeros as well as the Yacht Club (no big deal the three of them put together).
Hire an english speaking driver for the day. Make this abundantly clear tothe front desk help- even then it might be a stretch to call your driver English speaking. For a cab, ask the front desk "how much to pay" at the end of the booking process.
From CCV, the place across the channel from your location, FIBR, we can hire a van driver and take 8-10 people back and forth to The View for $20 and still be back for the night dive!
Hire a driver, enjoy your vacation.