Seeing as we don't have any other kind of botanical gardens out here (that are NOT desert landscape), this is a wonderful little retreat when you want some foliage outside of rocks and cacti.
They change it for the seasons and it is always maintained very well. Best part? Free! It's even right by the elevators you take from the parking garage.
It gets pretty busy and lots of people take pictures, so maybe visiting in the early afternoon or late evening would be better if you want to avoid the 'tourist rush.'