Best Places for Meditation in Sri Lanka:
1. Na Uyana Monastery-Kurunegala
www.nauyana,org
2.Meethirigala Nissarana Wanaya- Near Wedagama,Kirindiwela
3.Kanduboda Vipassana Meditation Center- Delgoda
4.Kalugala Monastery-Baduraliya,Matugama
All the places are very quite,surrounded by natural streams and forests(except Kanduboda). I dont have the contact nos..but do a little search on google and you'll find it easily...
Contact the monastery before you go there, sometimes places are crowded with laymen,, be sure to wear white Saron & Shirt if you going to stay... and most places need clearance report from police/grama sevaka or chief priest of the temple of your village/town..
hope this helps and wish you achieve ultimate spiritual freedom..