Aruba- pretty easy to get off, grab a taxi to do a quick tour and get dropped at a beach for the day.
Bonaire- try and book woodwind snorkeling tour through their website ($85 and it's a quick walk to the dock) Amazing trip and a fraction of the cost of the trip you listed. You can also rent a gold cart for $100 and drive the whole island yourself, stopping at beaches, photo ops etc... It is a fun day
Curacao-also taxis and tour opportunities when you get off of the ship. Taxis always running to mambo Beach if you want to do it on your own. Great place to wander into town and sightsee