There's going to be a wakeboard competition this weekend (1&2 March) at Raffles Marina (near the second link) from 8 am. Most of the wakeboarding will be in the morning and there will also be a bikini contest in the afternoon.
Check out this link for more details:
http://www.wakeboard.com.sg/index.php?showtopic=2298
Check out this link for more details:
http://www.wakeboard.com.sg/index.php?showtopic=2298