We went to Bali last July/August - I booked in a hurry, then spent months quietly worrying that I'd hate it. I didn't. I loved it BUT you have to really do your research and be careful about where you go
South - we stayed in Sanur which is meant to be the low key bit - but I didn't like the South at all (except 2 days surfing in Jimbaran Bay and loved that). Advice - stay out of the South
Ubud - gorgeous on the outskirts. Don't stay in the centre. We hardly ever went in and I love the surrounding areas
Amed - fabulous
Sideman - great village on the way
Gillis - fab
I dream of going back! And I'd go to the West and North, i think. And Komodo
There is something addictive about it.
The summer is the best months to go, if you are restricted by term time. Weather was fairly perfect - not at all humid. Sea was clean, although don't go to Bali for the beaches. They are very unimpressive - except Amed. Black volcanic sand (near Mount Agung) and great snorkelling. But these are not perfect swimming seas
People are just lovely
The smells are divine
Food is great
I just felt a real affinity with the place, I can't tell you why - I'm difficult to please travelling wise, so I surprised myself as it's a divisive place. You either love it or hate it.
Accommodation is also great. If you plan and book you can get some great deals