Actually it's "here's where the tanks are located, here's how to access them after hours. Where's your truck, I'll help you load some."
In all seriousness, you're required to attend a Bonaire Marine Park orientation your first morning before being allowed to dive. So all of this will be explained in great detail. And you have to do a bouyancy check-out dive immediately after orientation, some diveops will have a DM accompany you, others will turn you loose for that. There's almost always someone willing to go along if desired also.
The reefs on Bonaire generally parallel the shore. So typically you drive to a dive site, parking sometimes within about 20' of the water, gear up and wade out before donning fins and diving.
Most (not all) also are marked with a ball indicating the start of the dropoff. So you head out, determine the direction the current is flowing - easy to do as you can see the soft corals/fans on the bottom - the viz is almost never less than 60' and mostly better than that. Typically it gradually deepens to around 40' then rolls off down the wall to 135' or more. In a lot of places, we never went deeper than 60', the bottom is just solid with corals, fans, critters almost everywhere.
Do your dive leaving enough air for the turn and return, start by swimming into the current as it helps coming back. One of the harder things to do at depth is determine where you've parked the truck. So look for some obvious physical formation when you descend. At most sites, I spotted the mooring rope, but I've been diving a while....
Be aware that although Bonaire is the shorediving capital of the Caribbean, it doesn't mean always easy entries. At a lot of sites there's sharp ironshore and coral that you have to climb over to get deeper water. Slipping can cause some pretty substantial cuts/scrapes - speaking from experience, I have a 4" x 1" scar on my shin from stepping into a hole with something sharp at the bottom - probably coral.
What you may want try until you're familiar with the conditions is dive the resorts. Almost all the northern dive resorts are on named dive sites, some provide access to several. Examples, Habitat is on the LaMachaca site (small wreck) with Cliff just to the north. Sand Dollar/Den Laman Condos share Bari Reef - the #1 site in all of the Caribbean for counted species of fish - something like 4-500 different varieties. Bonaire Dive/Adventure located there has a naturalist on-staff and will teach you to do an official REEF fishcount if desired. It's a good way to learn what you're seeing all week, they carry a slate and write the names down as they're found. There's also a good dive off Buddy's Reef. Nice thing about all the resorts is they have facilities right on the water and a divedock that gets you out far enough to (usually) giant stride off the end. (exception being Bari Reef, I hit the bottom there...lol)
Divesites south of town tend to be much more open and all are beach entries. Some over ironshore, some with breaks in the ironshore (often the best place to get out) and some are as close to a sandy beach as Bonaire gets.
Most of the DM's also freelance. Doing either of the pier dives requires you to be accompanied by a DM. Set that up through your resort. Salt Pier is a good dive, Town Pier is only a night dive if you feel ready for that. It's probably one of the easier ones you'll do, there's steps right into the water and it's not very deep. Spectacular cup corals open at night only, it's one of the signature Bonaire dives.
At your experience level, stay away from the far north or far south divesites. The ones marked
advanced on any divesite book you read. The currents can be pretty swift in the afternoons. On the south side, it's next stop Venezuela...LOL.
With only 20 dives, you may want to stay off the Hooker also, it's fairly deep. Some diveops also do it via boat so that's an option. There's also a couple of shallow wrecks around Eden Beach but they're small.
The other thing to be aware of is that although Bonaire has a highly evolved dive industry, there's no coast guard or other rescue operations to speak of. Not even a lot of police or emergency crews. So you're on your own at the more remote sites.
Bring really good
treaded boots - can't stress this enough. The ironshore is sharp and slippery, the coral rubble is caught right in the surf line typically. Most entrances you'll likely want to do holding onto each other.
And gloves are forbidden in the Marine Park (everywhere) so don't touch the mooring ropes - especially in the south, some are covered in firecoral.
This posting is sounding more negative than I intended, the shorediving on Bonaire is really among the easiest I've ever done, both from a logistics standpoint but more importantly the reef in most places is very close in. Unlike Curacao where everything was a swim out.
Staying at any dive resort it will be almost impossible not to find someone else to dive with. Most on a return visit. I was asked three or four times while waiting for my buddy one day.
