I rode 3 laps of The Pines with my kids yesterday in the morning, and the trail was mostly dry/damp, but not wet/muddy. I think there were one or two corners with avoidable puddles without going off the trail. I moved a couple small but potentially troublesome pieces of deadfall off the trail (at least troublesome for my kids' 16" wheels).
It was my 3-year-old's first ride at Stony creek, and he loved it. He made it half way through the rock garden, didn't fall off any of the bridges (came close on the inside of the curved/banked bridge because he went pretty slow the first lap), and even did the log pile that's at the bottom of a downhill (he pedaled a few times down that hill too!).
My 4-year-old was excited to finally get back here for his second visit to the pines. I missed it, but apparently he hit the log pile with some good speed. I was still at the top of the hill and he was excitedly yelling back, "I did the log pile!" A runner coming up the hill in the opposite direction had witnessed it and told me, "He didn't just do it; he went extreme!" He caught some air off of it and landed both wheels on the flat ground after the log pile