If you are not a native of Lakshadweep islands, you cannot travel without prior permission from the Island authority. The entry to the island is restricted by Act. visit the official site of Lakshadweep island administration, then you will have necessary information about application for permit and other things. If you are coming as a tourist , in tourist package, this is not applicable, and that will be explained later.
So now I will explain you (step by step) what things You have to do .
1. you apply for a permit as per the application which can be downloaded ( online too) from official sites.
2. Once your varification is done ( which is mere formality) you have to visit the Lakshadweep office in Wellington Island ( near Firestation) and apply for a ticket in the prescribed format , just like a railway reservation form.
There are different tariffs for islander and Mainlander . Also there are different categories in ships ( which can be viewed in Lakshadweep ports online shipping website) .
3. You check for the availablity of ships for the dates you want. But keep in mind, unlike train or bus services, there is no specific fixed dates for ships. There is no advance of online booking . So for rough weather season - thats from June to sep - getting tickets is a tough job. ( there are ticket office in Gandhi nagar, Wellington Island, and Beypore in mainland)
You will have to call several times to the Kochi Office of Lakshadweep port. So Collect the phone number when you go for permit.
4. After a hard work, you will get tickets, with that You come to the passenger center which is also situated in Wellington Island. From there you and luggage will be transported to PORT .
so Happy Journey...