I wasn't real set on going here even though it's ranked 3rd, but my husband chose this when given options on what to do. I learned some things and there were some great landscape photo opportunities with the Saguaro (sp?) cacti. My husband was free due to being active military, so that was a bonus. If it weren't for that, I'm not sure it'd pay to see again.
At one point, though, I saw 7 bunnies at once which my toddler loved, as did I. I also went during November, though, when the flowers weren't in bloom. So spring time probably would have been better. There is a lot to see, but it's kinda all the same.
This may be just worth a one time visit, but if you do go, go in the spring or summer.