I'm moving back to Austin after a long time away. Where do you folks recommend I take my X for maintenance post-warranty? I'm also interested in joining a local mountain bike club. My wife and I are still a rookies but we're looking to ride often.

Im in Houston but travel to Austin frequently to MTB.
Welcome back.
Plenty of good trails all over Austin and surrounding areas.
This is a good start for that.
http://www.ece.utexas.edu/~pfefer/biking/biking.html

I live in the Great State's Capitol. Are you looking for a recommendation to a dealership?

Welcome, Dan!

If you are looking for a dealership to service your X, I'd recommend Round Rock Nissan. They are one of the top-rated dealerships in the area.

If you want a local shop, Austin Automobile Clinic, Inc. off north Lamar has impressed me by the work he's done for a buddy of mine.

As far as MTBing, I have been wanting to get back into it. Let me know what you find out, or if you want to hit some trails.

I'll second Round Rock nissan as far as dealers are concerned. San Marcos is cheaper but also farther.

I ride a lot - several times weekly and know most trails quite well. Shoot me a PM or something sometime.

peace.

(edit to add my PSA....)
PS - Also if you need a realtor let me know.