The beach bums heading to sloth it out at the edge of Goa, Bali, Phuket or Cyprus should carry a handful, because that's all you'll really need.
A bikini to basically live in, okay two, in case the first snags
Shorts and gunjis for the day activities, if any
A few dressier outfits (if you head for a slice of the night life)
Sun block, flip-flops and a light jacket