Just did Ice Box Canyon for the first time in many years. Really, for five dollars you can't beat the fantastic drive out of the city... even if you don't get out of the car the scenery will blow your mind. I'm a hardened desert dweller and it still takes my breath away.
Ice Box Canyon is listed as 'difficult' but except for the rock scambling at the end to get to the second and third pool, I think anyone with basic hike experience could do it. We did wander off the trail towards the end - tired and in sight of the car park will do that too you. All the hikes are fun, but that one is my favorite for the pool and waterfall. Even though the snow in the city melted weeks ago, bare patches of it were still clinging to the ground just off the path.