I and my wife also went to Sri Lanka in last 2.5 weeks. There is a little bit difference in destinations. We went to Colombo, Mirrisa, Sinharaja, Uda Walawe, Bundala, Yala, Nuwara Eliya - Horton Plain and Victoria Park, Dambulla, Sirigiya and Polonnaruwa. We did not do much in Bundala because the jeep was jammed in mud for few hours. Sinharaja is a great place and we stayed in Martin's Lodge (at the edge of forest) for 3 days. We photoed around 120 species, include 20 endemics and some HK common birds. Perhaps we met somewhere in Sri Lanka and didn't know.
Although Sri Lanka is a small island, it is a good place for birding.