been a bit hectic last week so late reply:
I checked and you need a 1 star to rent out any kayaks. At least with water venture which organise lots of the water sports here. The course is easy, 2 days, 80 $ (incl membership) , locations Kallang, Pasir Ris and Changi I believe. (
http://www.water-venture.org.sg) Not sure whether there's any kayaking without the little star.
but let me know if you get the 1 star, I'm still looking for others to go kayaking with
sorry, cannot PM, don't have enough posts here yet.