Entrance to the gardens was surprisingly free, price paid for entrance to both domes was worth it especially the rain forest. Light show was like nothing we had ever seen before, totally amazing. Best time to go is mid afternoon, then you have time to walk all of the magnificent park and find a good spot to view the light show. You can take a picnic and sit on the lawn to watch the show, and as its free you can do this every night if you want to!!!
I was unable to use the voucher Viator sold me. I had to pay cash on the day of my tour. The people at the Gardens By The Bay called Viator 3 times and the phone just rang and rang- no answer and no answering machine. I can find no place on this site to contact Viator's customer service team they talk about. I am hoping they contact me as a result of this post.
If you book before visiting it makes things so much easier and there is n doubt that if you visit Singapore this is somewhere you must visit. What an amazing experience and feel that another visit should be made.