Hala Tree was at the top of our list of places to try, and it was my favorite of all the coffee farms/houses/cafes we tried! The staff were all friendly and knowledgeable about their coffee selections, and even though we didn't go on a tour, they answered all our questions about their coffees. We decided to do a tasting and ended up going home with a bag of the Geisha coffee.
Make sure to stop here, even if only for a quick tasting!