According to you what is the best time to visit Bali and what are the most definite things to do that time of year?

Watersports& Activities?

I would also suggest to go in July/August. Just great then! Don´t miss the Mola Mola ;-)

In Australian dollars you can stay in a Home stay for Au$10(70,000 rupiah) per night this offer bed, fan and cold water shower upwards if you want air conditioning and hot water expect to pay from Au$40 approx(300,000 Rupiah upwards) per night. This will often include breakfast and cleaning. If you are considering choosing Hotel when you get there this is the lower end and of course your high end Hotels can be around Au$150 per night (from 1000 000 Rupiah)
These prices are for the Tuban, Kuta, Legian and Seminyak area. Nusa Dua and Sanur are similar in price. Some good deals often appear with travel agents for flight and accommodation, saw one last week for $875.00 flights and 4 nights. Hope this helps

You say July August is best time to travel. We can only go late November. Will is still be sunny? and what time of day does it rain?

We went after each bombing, security really good especially in hotels. We just went May, weather was perfect, also been September October - hot
December - wet.
There are good deals with Airasia at the moment for flights

I always recommend all my friends and associates to visit Bali during the dry season. May, June and July are generally considered to be the best time to travel to Bali in terms of the weather.