Yeah, if you're going to be smoking in a public place a joint is probably your best bet. Just smoke one at the beach. It looks exactly like a cigarette to everybody else if you just keep your distance.

But if you're going to be smoking your bubbler in a bathroom stall and need a way to get rid of the smoke, here's an idea I've never tried but might work: get a package of balloons and blow the smoke into the balloons. Just make sure you know how to tie one off when you're high, and you have some way to dispose of them afterwards. Blowing it up the faucet will NOT work because there is nowhere for the air to go.