[Arubalisa]

There is nothing to see in the waters off the Westin or most of Palm Beach for that matter. It is just a white sandy bottom. You may see some fish swimming by, but that is just a random thing.

If you have your own snorkel gear, for snorkeling, a short walk south towards the Phoenix Resort, there is a break that goes about 80 yards out into the water. http://www.wikimapia.org/#lat=12.5663237&lon=-70.0513762&z=17&l=0&m=a&v=2 The water is very calm there. There is also a little rock island
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Here you should be able to find some fish, octopus, etc. There is a little Polis (Police) substation right there on the beach (point of reference- between the Westin and Phoenix). This is a perfect spot on Palm Beach if you just want to do some snorkeling on your own for free

Unfortunately the sand here is loaded with tiny coral pieces and rocks, but there is free shade
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No chaises though nor much else close by. See the bottom half of the page http://www.arubabound.com/photos/plmbch/pbch3.htm

IF you need to rent snorkel gear, http://www.arubawatersportcenter.com/pricelist_WS.htm the Aruba Watersports Center is right there on Palm Beach. They are located at the northern end of the Radisson's beach.

I also just wrote up directions for snorkeling Boca Catalina and Catalina Cove at http://www.arubabound.com/dive/snorkeling.htm

SNUBA http://www.snuba.com/about_snuba.aspis available through packages with De Palm Tours. http://www.depalm.com/watersport_diving/watersport_diving.html Imo for the money, take a "resort dive course" and go for a scuba dive. Closest to the Westin would be Unique Watersports/Divers.