We are just about to book a trip to this area either mid-end September and in researching online I've learned that it's rainy season. Obviously no one can ever guarantee the weather, however, does rainy season in this area typically mean it is more likely to rain than the non-rainy reason months or should we be prepared for a monsoon every day and not bother going because we won't be able to swim, go on excursions, etc? Or, does rainy season mean there's still sunshine but it rains on and off, which I can totally deal with. I tried to Google for September 2011's weather calendar to get an idea but came up empty handed. Unfortunately this is the only time this year we'd be able to go, so it would be here or somewhere else, and really have our hearts set on the four seasons Costa Rica. Any advice as to what September rain has looked like there in the past couple of Septembers - daily monsoon or rain on and off?