Crossing an icy stream in Intelligence Valley Intelligence Valley and Yanqi Lake, 2018/11/25 Intelligence Valley is one of our easiest walks, and we added on a stroll by Yanqi Lake to make it a longer day—see eight photos of the valley scenery and one of Yanqi Lake. Were you on this trip? How did you like it? We'd love to hear from you. • Send us feedback • Review it on TripAdvisor • Share this page on Facebook We passed the (closed) Liyuan Library. Crossing a stream in Intelligence Valley. We took a break at a pool further down the valley. On the boardwalk by Yanqi Lake.