We didnt go into Floral Fantasy. It was a new display at that time with a separate ticket ($20) to those for the Cloud Forest and Flower Dome. There is a bundled ticket to include it with the 2 domes if you wanted to do all three and that saves 10%'ish.

We used the Klook app & had no issues

There's various options.. The full package.. Like all the domes... I think it's like 50-75 spd.. Each done on their own costs maybe 20 spd...

We also purchased our tickets in advance via a discount site KLOOK. Recommended.

yes gardens are free but pay to go in the cloud or flower dome and its worth every penny probably the best in world I missed cloud maintenance but flower gardens surpassed my expectations but think cloud even better . not sure sky walk its novel , the other I loved was the flyer the big wheel you cant imagine the view I say forget walk and go on flyer . some good street food under it and if cheap fast food there is a subway at flyer , and Macdonalds at the cloud not saying healthy but if kids it fills space not over top on price at time .

My suggestion is not to worry about tickets in advance. Just go to the gardens and purchase your tickets there. You can do the domes during the day like we did and come back in the evening for the light show. Whatever suits your time in SGP. You can eat cheaply at Satay by Bay in the gardens which is only 10 minutes from the actual light show. There are other eateries right at the light show. We preferred Satay by the bay. Great value. Plenty of options so relax. The light show will be worth it. Enjoy.

Lots to do, we just completed 8 days here and were out all day for 7 of them. Top 3 things to do (each will take a full day) 1. Gardens by the bay - worth paying extra $ to visit Flower dome & cloud forest. The light and music show at supertree grove (7.45pm & 8.45pm). Is amazing and my son loved it 2. Universal studios on Sentosa island (a fast pass may sound expensive but well worth it on a busy day- buy it at the park on the day. Go mid week for quieter queues 3. Hop on / hop off bus tour, Singapore flyer & walk around Marina Bay

It depends on which one you buy. I bought one which included garden dome and cloud forest. Note that you need to visit them all in one day.

You can purchase on line or at the gardens

Try to buy online. Check their official website. When we visited we just bought the tickets at the gate.