i went to the ocean last year and to be honest i did my meds about 50% of the time. this is just me but being in that ocean air during the day really made meds fruitless and seemed pointless, everything was already out. i could tell when we were getting close just because i could feel a difference in the way i felt and how much i was coughing because of the ocean air. i would say that the pulmozyme of everything is the most important thing to make sure she gets in just because of how it works, it breaks down the junk in your lungs to make it easier to get out. running around at the beach and swimming in the ocean should do a pretty good job of taking the place of the vest and the ocean air could make the HS non benificial. Ultimately this is your child and your call depending on her health, attitude, stuff like that. i completely understand the idea that she'll think that skipping treatments is ok, which brings in the parents descretion, if you explain to her why she isn't doing her meds like she normally is do you think she'll understand why and not get the idea that breaks are ok anytime?