I have been on 27 cruises and I believe you CAN do a good job of rinsing a lot of your gear in the shower. It just takes some time. you can even flood your bc (which I absolutely think should take) by putting the inflation hose up to the shower head. The regulator (which I also think you should take) can be rinsed the same way too. Don't push the purge button on it though. The only thing that you might leave home if you want to save a little weight might be the fins. You can rent them for 5 bucks. You want your own CLEAN regulator and the bc you're used to using. I take all of my own gear because I like to use the stuff that I'm used to wearing and with a little patience and time, you can rinse it quite well.