Best time of day or year for lesser-known sites to avoid crowds?

Early morning (right at opening) or late afternoon is almost always best. For places like Ritigala, Yapahuwa, or lesser-visited tanks and temples, going at opening time (often 6 or 7am) or after 4pm means you'll have the site with minimal or no other tourists. Weekdays are quieter than weekends. Avoid public holidays and Poya days for popular spots. For natural sites, early morning also has better wildlife and light. A good local driver knows the current quiet windows.