Look no further than here. http://www.mollymacpack.com/new.html
I own one (among others) and this would be my first choice for Costa Rica. They are super light weight and have kept me warm down to the 40s. They are synthetic so would be good for the rainy tropics. It's my go to summer quilt which can easily be supplemented with a pad if the temps dropped below your comfort level.
What kind of temps are you anticipating?
Miguel
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