I got married at the Marriott in November and it was absolutely perfect! Fortunately it was the day before the terrible waves came in. The day after our wedding, the palapas where the hotel set up our music and bar were toppeled over! We did a dinner the night before the wedding for anyone who wanted to go into town at Iguana Joes, and then had our after-party drinks at the end of the wedding night at Moobas. They were very accommodating and it was a lot of fun.
If you are staying at the Marriott Stellaris, the beach is not large and the Palapas on the beach (thatched huts) are reserved and rented by the guests staying at Marriott. Moomba Beach is an excellent place to meet. You might want to provide your guests with a welcome bbq. Moomba Beach has some reasonably priced packages. They will set your guests up with tables and chairs on the beach reserved for just your guests. However, you do have to make reservations with the Manager and not just show up with 60 persons.
Last time we were there they RENTED the chairs to us for $5 a piece...maybe we got "took".
No one mentioned the Sunset Bistro at Divi Phoenix, thats a super area. Their bar is outdoors, they have the adirondak chairs there, can set up high cocktail tables...just run a tab with them. Lots of beach space, perfect sunset spot.
There are so many good places to meet before the ceremony and also after the reception. Moomba is indeed one of them, but also consider the Paseo Herencia Mall across the Holiday Inn where you also find nightclubs and also across the Radisson for Chino Latino, Buster's Garage, Southbeach lounge and Hard Rock Cafe. So many places to chose from in walking distance from the Marriott. That should be it for after the reception.
I am pretty sure that 60 guests is not such a big group for the Marriott to handle before any event. They have certainly handled groups of 200+ guests so check with them also.
BTW: ALL BEACHES ON ARUBA ARE PUBLIC. ACCORDING TO THE LAST INFO FROM THE GOVERNMENT: PALAPAS ON THE PUBLIC BEACH ARE PROPERTY OF THE HOTELS, BUT ILIGALLY PLACED ON THE BEACH, so they are not allowed to reserve them exclusivly for their guests. In case they still do, they (palapas)will be removed by Government officials.