We went to the VLA this summer on a 4 week driving trip from Canada. Very cool, though the array was in the "D" configuration, which meant it was spread out over miles and miles and less cool to photograph. You do get to walk right up to one of the radio telescopes though.
Just a hint, the road signage for the VLA is very difficult to see. Watch all signs like a hawk. It's a bit further West than we thought it was. If you find yourself getting too close to the western mountain range turn back (signage was easier driving westwards anyways).
Also, New Mexico is awesome, and Santa Fe is incredible... we stayed there for 3 days and it was a great place to make a base camp and explore other places in northern-Central New Mexico (including Taos - cultural, not sciency).
The only other sciencey thing we did while there was go to the (free admission) (not Ray) "Bradbury Science Museum" in Los Alamos. If you love the bomb, I mean *really* love it, it's the place for you. We all found it exceptionally creepy.