All the best Jack! It's inspiring to read what you're doing..
About Sri Lanka, I've heard good things about all three of the monasteries you plan to visit.. I used to go to Mītirigala with my family every year when I was a kid for dāna. I've heard it's quite disorganized now though.
You might want to check out one of a branch of monasteries called Mahamevnāwa (name is harkening back to the golden Anurādhapura age) that I've found quite impressive. They keep to the Vinaya strictly and focus on the Dhamma-Vinaya (and not the Abhidhamma and Atthakatā) - which is something of an anomaly in Sri Lanka. The head monk Kiribathgoda Ñāṇānanda has almost completely translated the Suttapiṭaka to readable Sinhala (the Buddha Jayanti translation was done in the 1950s and is less readable than the Pāḷi since it was done to show "the grandness of the Sinhala language"). These days a lot of young university students are ordaining - there's a training facility in Mātara with over 100+ monks. In all, there are 500+ monks in the tradition.
There are 40+ branches around the country and internationally with headquarters in Polgahawela. You can find more info here:http://www.buddhavision.com/Mahamewnawa_m_centers.html
Hope this helps and feel free to PM me if you have any questions about Sri Lanka (I also have plans to go back sometime this year).
BlackBird wrote:When I arrive in Sri Lanka there are three monasteries I would like to stay at to begin with:
- Na Uyana.
- Mitirigala Nissarana Vanaya (for the Rains retreat, have talked it over with Ven. Dhammajiva Thero).
- Potgulgala (Where Ven. K. Nyanananda thero resides).