JD: the lack of response to A380 is likely to stem from his thread in this forum .....
Bali activities are pretty much up to what interests you. You can do beach from honky-tonk to ritzy; culture in buckets full, and "activity".
Seminyak (my choice to relax) is a happy mix of easy-going tourist life and beach. Some prefer heading south of the airport to Jimbaran where there are a number of western chain hotels. Avoid Kuta (the resort between the airport and Seminyak.
Ubud, towards the centre of the island, is the focus for those more interested in "cultural" tourism and greener scenery. It's a little cooler than the coast.
You could easily sample both - and both have accommodation to suit all budgets.
The north coast is lovely, but probably too far for a short stay.
There's lots of good stuff on Tripadvisor.