There are some great divespots on Curacao. In general there are not many large marine life, but it’s not uncommon to spot turtles and stingray among others in a single dive.
The islands best wrecks are the Superior Producer and -for snorkeling- a fun wreck is Tugboat. The Superior Producer is Curaçao’s premier wreck dive and is a must-do. It lies close to the (outer harbor) docking location for the big Cruise ships and because of safety reasons you can’t dive it when a cruise ship is docked (which is quite often during high season). If you plan to dive this wreck, organize it up front or as soon as you start your holiday. Sometimes there’s only one day in a given week to go here.
The best reef is arguably Watamula, which is a boat dive from Westpunt . The coral is very rich and healthy.