I visited Wave Valley using the 'Round-trip Shuttle Bus to Wave Valley' option on the Trip.com app, as a found it difficult to find a shuttle from Yulin (IMPORTANT NOTE: The price quoted for this trip is leaving from Yan'an, buuuuuut when the tour company contacted me they told me they also had a car in Yulin, the price was just a bit higher). My driver arrived ten minutes prior to our departure time, abd the drive there and back was smooth and relaxed. Wave valley itself is larger than I thought, and so spent a happy three hours walking around and taking countless photos. The rock forms and colours are truly magnificent, and on my visit (August 14) there were some small wildflowers in bloom scattered about. The glass bridge costs extra and is interesting enough, but honestly I was more impressed with it after I was down on the valley floor and looking up at it - at that point I fully appreciated its incline and length. The cracking glass sound effect was scary at first, then fun.