Spend 2 nights in Kuta Beach to party & be amongst other tourists.
Spend at least 2 nights in Ubud!
Visit all the local temples. Be sure to follow dress code (women must wear shirt with sleeves and long sarong. Get waist band to tie around your waist. A scarf around your waist will do the job, too. Men have to wear waist band, too). It’s considered very disrespectful to enter a temple without appropriate attire.
Take a bath at Tirta Empul, Balinese sacred bath and temple. It’s located in Gianyar area.
Find local Balinese practicing Barong dance. (The only way to do this is to rent a bike or motor bike & bike everywhere near Ubud. Get lost & explore the rice fields).