Could anyone recommend a beach to visit during a weekend in SIN? Just looking for a place to swim and aren't looking for a lot of extras. Main thing is quality of water. Here is a list of beaches found in the forum and elsewhere.

Sentosa, isn't worth the time?
East Coast and the Southern Islands, boat service from World Trade Centre.
Changi Beach, close by
Pasir Ris Park, day trip?

Thanks for any info.