Can't help you out too much with the waether but I have stayed at Le Coco Beach and would thoroughly recommend it!
I stayed there around the Easter period about 4 years ago and really enjoyed my stay. We were there as 4 adults in our early 20's, my mother-in law and a young brother-in-law!
You'll have probably seen form brochures etc that the whole hotel is based upon a vibrant and colourful 'tropical' theme. It certainly isn't quite the same as some of the luxurious hotels on the island like Sugar Beach or Le Tousserok, but the whole hotel is certainly great fun and especially great for kids.
The entertainment nights were really good with traditonal Sega dancing and lots of shows involving the guests too, with a bar and a disco also. During the day there were lots of activites and sports (a gym too), and a club for kids if I remember rightly.
The rooms were airy and spacious and very clean with all the facilities you would expect.
One of the most memorable parts of my stay here was certainly the food! I can quite honestly say (although this was 4 years ago) that the food at Coco Beach was one of the best I have ever had. Evening dinner was buffet style (same as breakfast) but there was SO much to choose from and there were dishes from all over the world, as well as the wonderful Mauritian cuisine!
Generally, although this is a review from a stay some time ago, I would still recomment the hotel. As I said, if you are looking for the grand luxury of some hotels, then Coco Beach proably wouldn't be your 1st choice. But for an authentic 'tropical' experience and lots of fun, Coco Beach would be excellent!
Hope this helps