[Arubalisa]

What restaurants do people recommend? We are looking for great seafood (not too expensive) and restaurants with unique themes.

http://www.aruba.com/forum/tags/buccaneer.html
http://www.aruba.com/forum/f12/unique-experience-restaurants-39773/

What is the best beach for snorkeling? We are bringing our own gear and want to just go off on our own.

Very close to the Marriott
http://www.aruba.com/forum/f10/snorkeling-shore-39396/

Is there a place were we can charter a boat?

There are no self charters that I am aware, but check out perhaps http://www.robertoswatersports.com/ for someone close to the Marriott who offers snorkeling and/or bottom fishing.

How is the deep sea fishing?

http://www.aruba.com/forum/tags/deep%20sea%20fishing.html

What is the downtown area like? Is it safe? Is there plenty of shopping and restaurants?

Yes, Yes and Yes.
http://www.aruba.com/forum/tags/shopping.html

We are renting a car, how is the driving there? Is it safe?

Generally safe, but some discussion on that very topic http://www.aruba.com/forum/f38/main-highway-39847/

What is a must see on the island?

Lots of suggestions
http://www.aruba.com/forum/tags/first%20time.html
California Lighthouse
Alto Vista Chapel
Arashi Beach
Arikok National Park
Baby Beach

We have friends staying at the Renaissance, how is that hotel?

Many here stay there and love it. http://www.aruba.com/forum/tags/renaissance.html