A/C on the high seas
Almost any air conditioner will draw huge amounts of electrical power when running. You will not likely be able to support a/c operation without a generator running at the same time. Some gensets may be quieter than others, but you will probably not have that feeling of tranquility (nor will others nearby) with the genset running.
Like any complex equipment, gensets and a/c units can suffer failures, so if you go this route, keep in mind that you may find yourself without any a/c at some point. If that would be life-threatening in your case, you will need a backup plan.