Thanks for the suggestion, jiejie. I'll look into adding Chenyang to our northern travels. The reason for the long-ish stay in Yangshuo was simply to get a stretch of rest and relaxation (we'd be staying outside of the town, near the Yulong River). I figured we'd hike and bike and take a bamboo raft trip, and just enjoy the scenery in a unhurried way. After 4 1/2 days in Beijing and 2 days in Xi'an (plus travel days) I thought we might be looking forward to less hustle and bustle.
As far as Longshen is concerned...can you advise one night or two? And, Ping An or Dazhai? We'd like to have time for some nice, scenic walks, and my husband will want to take a million photographs.
Thanks for your help!