All the islands are interesting, just everyone evaluates them in their own way. From Curaçao to Aruba, airplanes fly, often enough to visit the island for 1 day. By sea - you can hire a yacht, but you will spend a lot of time and the price will be prohibitive. I recommend that you spend at least 2-3 days on Aruba, as there is something to see.

Remember that Aruba and Curacao are visa islands, the visa is issued by the Embassy of the Netherlands.