So, the college boys had good taste, and you had good sense!

There really are a few things here worth seeing.
This is probably the best:
http://www.desertmuseum.org/

Very unique. It says museum, but it's kind of a zoo, but it's not that either!

Mt. Lemmon is right on the edge of town, and is a little over 9000 feet high. Which is a bit taller than anything in the midwest. It's got the southernmost ski resort in the country. Though some winters that doesn't work out so well, especially as it has been kind of droughty lately. But the lift is open year round, and you can go up and see for miles and miles. It's also a lot cooler than in town, so it's a nice summer day trip!

And I think you could find a friendly guide.

If you are forced to go to San Diego again, that's not too far to get to, either!