In terms of birds we didn't see a lot though I did note four species of sunbirds, including Purple-naped, and there were loads of Pied Stonechat, Sooty-headed Bulbuls and Red-whiskered Bulbuls. We also had a Shikra circling around us.
With small kids we only managed the afternoon. I really enjoyed strolling through the greenhouses. It wasa bit hot and wet for strolling around trails. This is a site I will return to perhaps in the "winter" months when there is likely to be a lot more bird and plant activity. QSBG would make an ideal day trip for a party of birders and non-birders based in Chiang Mai and I rather fancy the Botanic Resort opposite the main QSBG entrance may be a cool place to stay, but probably at a price.