I went to Bali 2-3 months ago.
It was a bad time since humid was too high, I think from April to October are the best months to visit Bali. The humid these months are not too high.
Bali ppl or Balanies ( as I recall ) are too friendly and helpful.
Many activities everyday to do.
Some high rated resorts are a lot cheaper and the service is unbelievable. Comparing to expensive hotels.
When ever you want to buy something you must argue on the price

Only take tourists tours from kuta street, they are alot cheaper. They will ask for a high price at first, with little argue the price goes from 1,2 mill IDR to 500,000 IDR.
You must plan where you going to stay, since many activities need 1.3 to 3 hours by car. Bali is not that big island but due to its small and crowded roads, trips takes long time, I hated it when staying at car for 2 hours.
Whenever someone start a conversation with you by saying "Do you speak English", 99% he wants to scam you. Also, never use money exchange at kuta street unless its a bank or trusted place. Use google to read about the scams their.