I Am Going on a Vacation in Hawaii After One Month Post Op Rhinoplasty. Will This Be Ok?

If you are already 4 weeks post-op after your rhinoplasty and you have a vacation planned, you should discuss the details with your own plastic surgeon as to whether or not this is advised.  Typically, as long as the heat is not excessive and you are under an umbrella with sunscreen, you most likely will not have a problem.  The issue, as you probably know, is that your nose can swell internally in response to excessive heat. Also, you should plan on using a decongestant before you fly, since equalizing your ears on the plane may be more difficult due to the internal swelling. You don't mention whether you had an open rhinoplasty, and if so, the scar beneath your nose has the potential to become hyper-pigmented or darkened.  Good luck to you. 

Generally speaking, you should be cleared to take a vacation by
the one-month mark of your rhinoplasty recovery. At this point, you should be
okay’ed to fly, though your surgeon must be the one to give you
the final decision on this. As for enjoying your time in Hawaii, I would advise
that you be mindful of your recovering nose while on your vacation. Do not
participate in water activities or strenuous physical activities, and be sure
to regularly apply sunscreen to your healing nose. Your nose could still refine after a rhinoplasty especially if there was graft work done or if there is thick skin. As long as you are being
cautious and are being practical about what you can and can’t
participate in, your recovery should not interfere with your plans to go to
Hawaii.

It is perfectly fine for you to go on your vacation one month after rhinoplasty.  The bones of the nose, assuming your surgeon had to fracture the bones, are very stable.  Still, I would avoid situations were your nose could receive contact or trauma, such as contact sports.  As alway, you should use sun block on the nose for general good skin health.