Not sure when they'll next be organising a 'coffee journey' to their farm:
But to learn more about coffee, you can just talk to Lee at either of his 2 cafes in Chiangmai (most of the time he will be at this one: http://www.akhaama.com/about-cafe/directions/)
This is something that I've also been wanting to do for some time but haven't gotten around to yet. I'm pretty sure that most coffee and tea farms are happy to have visitors. My guess - so, yeah, not certain at all here - is that you can just show up in Chiang Rai and either visit farms yourself by motorbike, or ask around at the cafes until you find a guide to take you. If you'll be in Bangkok first, stop by Gallery Drip in the Bangkok Art & Culture Center; the owners have traveled the northern Thai coffee farms extensively and they're happy to share their experiences when they're not too busy. One of them also put together a great book of photographs that documents coffee production in northern Thailand.
If you end up doing it, any reports would be much appreciated.
not sure how 'private' they can be...those coffee farms i know of in north Thailand are not large scale fenced up plantations run by companies, but small holdings by individual farmers/villagers. there are farms in places like Doi Chang, Doi Wawee & Doi Laan in Chiangrai province (area south of the Mae Kok river, west of the Chiangrai-Chiangmai highway & east of Phrao), & Mae La Noi in Mae Hong Son province (where Starbucks used to source from, but heard that they no longer do). but access to such places can be tricky e.g. the last 30+ KM to Akha Ama's farm (the owner's village) is steep mountainous dirt road that can be impassable in the rainy season (villagers do die in accidents coming down that road). if you have a motorbike & can handle it on such dirt roads (or a 4WD) then it's easier to visit them by yourself.
a write-up on the Coffee Journey: http://blog.ohheyworld.com/a-little-story-a-journey-to-find-what-sustainable-coffee-really-means/
many tea plantations in Mae Salong that are all set up to welcome visitors, but think coffee is your focus?
I fly into chiang mai, but I will still check out Gallery Drip for further reference.
Seems like I will just go around and see what I can arrange when I arrive. I contacted them about the coffee journey but it doesn't line up for my dates while I am there.
I love tea plantations, but I really want to see coffee plants.
Thanks for the help and information :)