When will u be back? How many days will u plan to stay there? Regarding the schedule, u can just roll down a bit more and take cheukwingMami's as u'r reference. (cheukwingMami, u won't mind, r?)
And pls share u'r experience after u'r trip coz we family will depart on 17/7.
I didn't stay in Sentosa Resort & Spa but did stay at Shangri-la Rasa Sentosa Resort which is quite good. If you have kids, I think Shangrila is better. They have pools with water slides and a big beach just several minutes walk from the hotel (although there're not many people swimming in the beach as they said the sea is polluted).
I have just come back from Sentosa Resort & Spa. The swimming pool is not ideal for kids to swim. It's quite a dangerous one since less than 1/3 of the pool is less than 1 m depth. Suddenly, it's quite deep even adult cannot stand! Taller than an adult, it's more than 2.5 to 3.5m depth!