It's best to have a compass & computer or depth gauge, for each diver, to navigate in Bonaire. What we did was take a heading from shore to the buoy, say West. That makes East home. Surface swim to the buoy, usually no more than 50 yards, descend & take a depth reading, ussually around 30 feet. As has been said many times swim into the current. You're on your own so you need to pay attention to your air usage (actually the dives will be parallel to shore so even if you run low on air you can surface & either swim or walk back to your entry point but I prefer paying attention). When you reach the turn around pressure, which you've already discussed, make your way to 30 feet as you swim back & you'll run into the buoy line. Turn to the homeward direction, in this case East , swim to shore & you've just navigated a dive. Your confidence will grow through the week. I suggest doing a night dive later in the week in the same location as one of that day's dives. You'll have some confidence in your abilities at this site & the critters you'll see on a night dive will be quite different that the day dive. If you hook up with somebody, do the navigation yourself anyway. Insta-buddies are like a box of chocolates, you never know what you're going to get. It's easy, just have fun.
Safe diving
Richie