Really...? A strobe still burning after you spent the time to gear up, returned from a dive, stowed your gear and shared what you saw while on the dive.... Maybe somebody did leave it by mistake... or do you just snag it once you see it...?
To the OP, I use a small "buddy" strobe to mark some difficult exit points...
Glo-Toob FX Infrared Lightstick Oil Slick comes to mind as it would be tough to get out if you could not find the ladder! I just tied it to the bottom rung... On other dives, IF I felt the need, I would tie one off at our return point (could be 30-80' deep depending on the dive) so all we had to do is shoot a azimuth and we would hit our exit...
I never worried about someone stealing our strobe but then I never left it laying on the beach for "CoolTech" to snag...
PS The only dive sites on Bonaire that I know had markers leading in and out were the AI's e.g. Buddy Dive.... I don't recall seeing any type of aids on any of the other sites... Hooker makes a nice night dive and so does splashing Oil Slick... Bachelors Beach makes for a really easy and nice night dive but climbing down the ladder to the rocks and getting off the rocks can be tricky but a good dive light with take care of that...!
Enjoy your trip... lee