From the parking lot to the observation deck (click here to see where it is on a map) you walk through some pretty dense forest. We were there in August so things were still very green. Along the path was this footbridge that crossed a pretty wide, slow moving stream.
For the most part Alaska is a very wet state, and Juneau was no exception. The sky was pretty overcast for the days we were there, and we got drizzle and rain on and off the whole time. Luckily the rain held off on our walk through the woods.