Any recommended monasteries in Sri Lanka that offer extended meditation retreats? Could anyone provide links and/or info about Buddhist monasteries in Sri Lanka that offer extended meditation retreats?

For those who have taken part in such retreats, how was the experience? Would it be challenging in any way for me, an American, who has never been to Asia before, to travel there/adapt to the culture?

Thank you
Please refer these links.

http://nauyana.org/

http://www.sadahamarana.org/?page_id=48

You can google for these links. Please do some background checks, before you go there. False teachers can be exists like infamous 'Pitiduwe Siri Damma'.