Just got my perfect town today for the first day. Can anyone tell me what I can and can't do to make sure it doesn't revert? Cause I could really use that can.
Can I transplant flowers? Can I upgrade the town hall or make the flower clock (or any other project) without sacrificing the 15-day streak?
By transplant flowers do you mean pick them up and place them elsewhere? If so then yes, you can do that without harming the citizen rating.
There are certain projects that can decrease your town rating, so it might be safe to wait until you get you Gold can before building.