I think at THIS point (still don't have tickets), we're planning to fly in Wednesday, with the rehearsal and all being Friday (?), so I should have Thursday to do a little goofin' around.
OK - cool. I'll be able to come get you in Tacoma if you won't have a car. Are you staying at a hotel in Tacoma? Remember you are welcome to stay here as many nights as you need also.
You'll get lots of driving experience, but it sounds like you've planned the trip to be not TOO strenuous as far as the amount of driving you'll do in a day. Also, when you get to CO, there will not be the stress to have to find a suitable car for being able to go on interviews, etc.
Just my opinion; put it with the others in the circular file, if you wish. ;o)