I've live in the Renton Highlands now but have also lived in Issaquah/Sammamish since 1995, yet I never fully discovered this trial until January 2014. WOW, what a wonderful surprise!!!!
This is a very scenic and peaceful hike without a lot people despite a small parking lot which can easily overflow to 900.
I've taken my active 4 year old son on the Wilderness Creek part which is still a very steep upgrade, but he's managed to do it all without being held. He was tired and complaining toward the end though, so overall I don't recommend this one for young kids.
I am a photography blogger so I'm always looking for beautiful trails to photograph, so this was the perfect location. You can see some of my pics in this blog post - http://www.ronmartblog.com/2014/01/landscape-shooting-with-zeiss-otus-55mm.html
The trail was in good condition and so full of interesting things to see that my 3.5 hours hiking simply wasn't enough.
I did get winded a few times and had to take a break, and 4 days later my legs are still sore from the hike so this isn't for people with bad knees or bad hearts. There were a few times my lungs and heart were really pounding, but I'm a geek who sits behind a desk a lot so I'm not an active hiker.
You can't really describe this trail very well - you have to see the pictures (in my article) because words don't do it justice. It's just so amazing with little bridges, tons of green moss, ferns and mountain streams. Every minute of this hike is exciting and fresh, so it never gets boring until you get to the top of the Wilderness Cliffs. That area is still pretty, but after what you see to get to it your bar is much higher.
Going down without taking many photos was fast - I got back down in about 45 minutes, so if you don't have a camera and just hike you can do quite a bit with 30 minutes in and 30 minutes out.