Hello
Think about what sort of people would value your accomodation and then what the best channels are to use to reach them.
You could try approaching travel bloggers that might be interested in Mauritius and wedding bloggers.
You could also talk to the tourism organisation representing your island and see if there are opportunities to getting involved in relevant promotions and listings on their site.
During an off peak period perhaps invite a local journalist who is a travel writer or writes for wedding magazines to spend a few days if they will provide a write up (they normally have editorial control).
You could also set up a twitter acount and use hashtags to search for relevant topics and engage with those who have an interest in staying in mauritius/honeymoons. You could post pictures of your accommodation, life on the island and what you can do on honeymoon.
Depending on the value of your property it might also be worth looking at targeted pay per click advertising.
(I work in marketing and PR 🙂