Got to agree with previous posts.
Mauritius - the hotels and beaches are lovely, but the island itself is not very interesting,mostly sugar cane.
Seychelles - more scenic than Mauritius,you can visit some of the surrounding smaller islands that have tremendous beaches.
Thailand - Bangkock is OK for a few days sightseeing, Phucket is scenic and plenty to do,
the island of Kho Samui was brilliant ten years ago,but very commercialised nowadays.
Bali - havent been there yet -maybe next year.
If its sunshine and sand you want then probably in December - its difficult to be Dubai
Cheers
Ian