My office in Waikiki
I separate my work time between Japan/Asia and Chicago. Hawaii is roughly halfway between the two and the perfect place to effectively get work done. In the mornings I get telephone calls and emails done with the team in Chicago, while in the afternoons I chat with partners in Asia.
As for the rest of the time... pure paradise! For this trip I stayed at the Aston Waikiki Circle in an oceanfront room. The best!