Make no mistake, Palm Beach is where you want to be when you are in Aruba. A wonderful beach. Lots of water activities of all kinds (with the exception of a submarine and of the nicely sheltered Baby Beach at the southern end of the island). Lots of shopping in the hotels and at the Palm Beach Plaza and Placeo Herencia, a wide range of restaurants, many of them very good indeed. Placeo Herencia's "dancing water" shows each evening (on the hour starting at 7:30) are fun and, even better, entirely free.
In the evening, in particular, this area absolutely rocks (including, if you want, a Hard Rock Cafe). And, yes, there are a number of casinos as well if that's of interest to you (it's not to me, though).