g'day matuci77
congrats on your upcoming and wedding and honeymoon
ubud is a great spot to start with,also the north of the island like lovina/amed and candidasa are great areas to stay.my wife and i spent our honeymoon in amed at the anda amed hotel on the side of a hill overlooking the ocean,fantastic[look at website]very quiet and relaxing.
lovina is a good area as well for chilling out.
we used to stay kuta/legian side but too busy now,so we stay in sanur now[more laid back] but still close to the action
busta