We spent some 5 hours around the site and I have to say we really enjoyed it. Our driver found us a guide, whose price was 20 USD, but was really worth it. He was really proficient in English and told us many interesting stories and information about Pollunaruwa. We went around by car, which is also recommendable as the area is rather big. Go to the museum after you see the site-for me, it was a good wrap-up. Also, there is a nice hotel on the lake ( behind the parking in front of the museum) with lovely terrace, great coffee and fruit juice and a nice view.