Qube opening hours is 10:00am until 10:00pm. I checked in around 1:30PM and played immediately and not so many children.
As for the 滑草場 is way up to the hill and you have to take taxi - around $45. As I remembered is 2:30PM until 5:30PM but I forgot to look at the morning time. I arrived there at 3:00pm and it was extremely hot and we are the only family there.
I have 4 "澳門威尼斯人®2周年演唱會" tickets for sale. The concert will hold on this Friday 28 Aug at 8:30pm (around 2 hrs) in CotaiArena (inside 澳門威尼斯人". Pls pm me if interested.