Island hopping is the other main attraction. The main island of Mahé is the gateway. From here you can head for the 2nd island of Praslin, which boasts some of the best lodges and resorts. Then maybe onto the car-free La Digue, or the sanctuary of Bird Island. Finally there are the many island resorts, some of which can be booked for private use.
The temperature rarely drops below 24c and the wettest months are January & February, so the Seychelles really is a year round destination.
Being close to the equator and tropical you can expect short showers at any time of the year, with probably April/May and October/November being the very best times to visit.
There are regular flights from the UK (largely via the Middle East), and several a week from Johannesburg, Nairobi, Dar Es Salaam and Mauritius.