I’ve stayed on Aruba twice (not as part of a cruise). We did a jeep tour one time that took us to the lighthouse and the other side of the island that was pretty cool. Then we ate lunch at a local spot and ended at a beach. It was a pretty fun day. There were some cruise passengers on our tour and they dropped them off at the port when we were done. If you want to see the entire island, I recommend a tour like that. Otherwise, for a beach day definitely hit Eagle beach.