Aruba is my favorite place to visit. Many years ago, when we stopped off on a cruise, my DH wanted to buy a vacation home there. Although I wouldn't go as far, my family likes Aruba better then Hawaii (personally, I love Hawaii, except for the 12 hour plane ride for us). The climate is pretty uniform all year and the beaches are very comfortable to lay out on because of the constant cooling breeze, so you don't feel like you're roasting.
Restaurants are plentiful, terrific and reasonably priced.
Marriott will not upgrade you at the resort but, as posted above, if you exchange into a studio in II (Interval), keep on looking there, especially during Flexchange. If a larger unit opens up you can call II and exchange into it for an additional exchange fee. So, getting the 1 BR (or, if you are very lucky) a 2BR may cost another $99, but it is worth it.
You should check for the Ocean Club as well, since they are adjacent properties.
Enjoy your trip!!