You do get a deal, since there are two of you. You also get a deal depending on your amount of time there. The longer your stay, the less it costs per night. If you go any time between 8/19/08 and 6/10/09 with two people, it will be $3280 for four nights and $5310 for seven nights. For four nights, you save $830 and seven nights, you save $1309. I've never been to Canyon Ranch, but I did some research for you.
www.canyonranch.com/resorts/tuscon-rates-fees.aspx
The website has more info than anyone else could give you. I learned a lot from it. Hope you enjoy your trip.