Lola some helpful info to help you choose:
Corona Del Mar is closest to town - easy stroll down the beach. It's next to Coconuts which now has a big party bar and live entertainment many nights. There is a noise factor to deal with because of that however. I stayed at Coconuts and witness that Corona guests were allowed to use their pool (and hopefully their bar). I understand that Rasta Pasta now has a restaurant at Coconuts and they come highlight recommended by many boarders. Corona Del Mar has breakfast included and I hear Rum Punch in the afternoon?
Mata Rocks is next to Banana Beach and both are a ways south of town. I think you could walk to town, but it will take some time. Banana Beach offers all those great things o jackie mentioned - a large place with plenty of room types. I have not stayed there buy have visited many times and it's a great place for just about anyone (families, singles, couples on their honeymoon, etc.).
Mata Rocks has always interested me because it's somewhat on the small side, has a small pool and a open air bar on the beach. You can get summer specials that include breakfast and a free snorkel trip. That is why I have chosen to stay there my next visit in August.
You will not go wrong choosing any one of these, in my humble opinion.
Good Luck! - When will you be traveling to AC?
Gela's AC Motto: "All Roads Used to Lead to BC's"