To answer your question, I have not logged as many hours chasing bonefish as I'd liked to (but I plan to correct that over the years) so I hope someone else chimes in but I would start with the standard gotchas, charlies, shrimp imitations and crab patterns. I think these fish haven't seen a lot but they need a trigger. Maybe going in morning and evening would get them rooting more aggressively. I feel the fish's mood is much more important than fly choice especially at a place where they have probably never seen a fly before like Bermuda.
- gotchas/charlies in sand, tan, brown and pink / orange shrimp
- realistic shrimp patterns modeled after sand shrimp which I think are under-utilized for bonefish
- small crab patterns in white, sand / calico and tan
- stuff for cuda in case you get bored
I also recall seeing some mole-crab like husks along the beach. I did not have any small mole crab flies but I can imagine they are big on the bone's list of snacks. I also saw some insane mantis shrimp that I assume the bonefish would stay very clear of. Heck I stayed clear of them too.
I also would focus on deciphering their behavior for peak aggressive times, figuring out what they are most prone to eat without hesitation and getting as many shots as possible to try different things.
Your hotel is pretty close to Somerset. I needed to make the transfer from St.Georges thru Hamilton where you are just a bus ride away. You might consider finding Cambridge Beach and stalking it's killer falt during the off hours...
But overall there is little in the way of flats as seen in this Somerset area photo
The lagoons around the island are known to be target spots for the only guide on the Island, Mr.Pearman. If you rented a yak you might open some possibilities provided you chose lagoons with proper structure to hold bones.
Also when the tide got running through channels the water exploded with jacks and other predators. You might have a blast taking advantage of that scenario as well.
Lots of cuda around the boat moorings at the aquarium but good luck landing anything there.
Anyway I think if you poke around you will find something good to cast to! Good luck.