I bring a little waterproof plastic wallet or similar with driver's license, some money & the truck, hotel & room safe keys. I've yet to commit to putting an iPhone worth hundreds in a plastic case & diving. I could rent a Digicel cheapy, I suppose.
Yes, the entries & exits over iron shore can be rough. Gloves being forbidden doesn't help that.
I generally 'repurpose' an empty plastic bottle for drinking water & a little rinse water. Nobody's likely to steal that. I take a chance on cheap sunglasses; so far, so good. I sometimes put an apple in the truck. If I wanted, a couple of PB&J sandwiches could be taken; in the unlikely event of theft, no big loss.
Anything else, I can go back to the room. It's a small island.
I love Bonaire, but I wouldn't pick it just to boat dive. I can hit Key Largo cheaper, sacrifice some viz. but get more fish, more big stuff and the option for more deep wrecks. Or a live-aboard with a similar dive count, easy daily dive workflow and more big stuff. In fact, if I were headed down to the Bonaire region just to boat dive & only shore dive the house reef...does Bonaire have any advantage over Curacao, from that mindset? Wouldn't I gain cheaper airfare, some sandy beaches, more topside attractions & a bigger island? (I've stayed on Bonaire 8 times, Curacao never, and when I compare, the more roundabout driving between shore dive sites I read about on Curacao puts me off). Both are below the hurricane belt & far enough south so water's warm even in winter. I've been told the diving is pretty similar.
Richard.
P.S.: The main thing I miss taking vs. a perfect world situation would be a second digital camera, to snap dive site & area photos without opening an underwater case (which I don't do), or shooting from inside a housing. That's nothing that's put me off from Bonaire trips.