Costa Rica in December - Surf Quality and Board Hire?

Hi, I'm planning a month travelling to Costa Rica in December. I'd like to spend a couple of weeks there just surfing ... I've read some great reviews of the surf there on some previous messages, but I was wondering what the waves would be like at that time of year as I heard the swell drops off on the west coast then? I'm an intermediate at the mo, so would be looking for something to enjoy and help me improve. Is the east coast better then?
Also does anyone know how easy it is to rent boards there as I'd rather not lug my board round with me when I'm travelling before. Maybe its possible to pick one up there quite cheap?
Lastly where would be the best area to head for to surf and hang out, somewhere with good waves but maybe away from the peak tourist areas and the masses?
Any info would be greatly appreciated.
Thanks very much,
Rich
Also does anyone know how easy it is to rent boards there as I'd rather not lug my board round with me when I'm travelling before. Maybe its possible to pick one up there quite cheap?
Lastly where would be the best area to head for to surf and hang out, somewhere with good waves but maybe away from the peak tourist areas and the masses?
Any info would be greatly appreciated.
Thanks very much,
Rich