It took us about a 1/2 an hour to walk from the Rainforest Cafe to Cirque, but we were not rushing.
I know there is construction going on because of the new restaurant being built and I am not sure how much of a hassle this could be. But otherwise it is very easy to walk from one end to the other, for lack of a better description the whole area is like a concrete boardwalk.
There are 2 bus stops one is at the Market place and the second is near Pleasure Island. The second stop brings you closer to the Cirque.