Nick,
You will enjoy Mauritius tremendously. Although much of the reef bottom fish was decimated by the effluent of the sugarcane fertilisers, thereby breaking the food chain in the waters around Mauritius, sugarcane farming is not as widely practised anymore as in the 1970' and 80's.
Life is again returning to the inshore reefs, and over many years I have observed bottoms and pelagics return.
You will do very well with dropshot on the innerside of the reefs as well as on the outer open side. As soon as you get there, ask and shop around urgently for a small motorised type fishing boat with a local guide who will know the spots well - they cost next to nothing for a day's fishing compared to the bigger fishing outfits. Watch the beach as they patrol up and down advertising their services for guys like you. They are negotiable so make sure you get a good price.
You might want to go out to deeper blue water on a day or two, but for that best to ask and bargain around as prices can differ substantialy.
I have been above Port Louis quite a few times at/in an area called Grand Baie. There are catamarans that charter everyday (weather permitting) to an Island north from there called Isle au Cerfs. These boats have offices at the small marina/quay in the Gran Baie, but you can also book at most popular hotels and arrange transport to Gran Baie.
Although you cant fish of the boat with other tourists on while cruising to the Island, once there and anchored for the day (while they braai for you) you will be free to fish but remember it is a marine reserve and you will have to release all you catch. I have never seen so many fish in my life and took great pleasure (on a number of occasions) to create feeding frenzies throwing crusts of bread at the fish. I have vowed to return to fish there, but first have few other destinations to try.
Mauritius is a very friendly and safe place, you will not ever feel threatened. I am sure there is some petty crime and have in the past been warned to avoid the "slummy" areas of Port Louis.
You will be visiting during the good months for fishing, prepare for very humid and hot conditions.
Good luck, hope you will give us a recount and show photo's of all your wonderful experiences.