Re: Orientation and check-out dive (at Plaza Resort)
Since this topic came-up, I wanted to describe the experience related to Plaza, where we stayed.
Flight arrived like ~2pm. Fiddled at airport trying to get rental car but then decided to take taxi, so it was probably 3pm before we were checked-in to room and I trotted down to dive shop.
They were VERY casual. Signed me up for morning dives, before paying ( "we'll catch-up/settle later" ).
Paid the marine park fee & they invited me to sit at table for orientation - again, very friendly/casual: provided map, gave the "don't touch/molest" talk & described where to get your tanks & how to sign-up for boat dives(if desired).
So it wasn't a "fixed time" it seemed for orientation, just "as needed".
As for the "check-out dive", since I'd signed up for morning boat dives (no rental car yet) I told them I didn't want to waste a boat dive mucking bout with a DM holding my hand, they basically said - "don't worry, just drop down w/DM & they'll make sure you've got bouyancy control & leave you alone".
Anyhow...that didn't happen anyways, as I left the shop after the brief orientation, grabbed my gear & headed to the beach (one end of house reef where there's a mass of filled tanks to grab), setup & did 1st dive (~1hr after arriving in Taxi?).
Next morning on boat capt asked "anyone need to do check-out dive/not dived here yet?" one couple answered yes - so think DM might've made sure they didn't dive bomb the reef. Otherwise, I didn't answer affirmative as I'd dived already upon arrival.
It was mentioned that you don't have to have someone dive/watch you - I think the idea is just as long as you've checked your weights & have your bouyancy (on own) is fine.
So for what it's worth - non-issue with orientation or "checkout dive" (seems self-serve is fine).
P.S. Look forward to hearing about how your trips to Bonaire go!