The Zilker Botanical Garden is what I envision if I were in Heaven with its herb garden, prehistoric garden, cactus and succulent garden, butterfly garden, rose garden, oriental garden, green garden, and pioneer village. I have been many places and for a $2 entrance fee I thought it to be of one of the best values ever. There are so many excellent photo opportunities in the garden areas. It is peaceful, relaxing, and beautiful. I walked it during a day that had 102 degree temperatures and felt totally comfortable. This garden will show you how important canopy cover is to maintaining cool temperatures on the ground even during extreme heat. For more information on Zilker Botanical Garden click this link: http://www.zilkergarden.org/
2018 Albert Moyer, Jr. Photography
Albert Moyer, Jr. 
I haven’t been since they started charging (over a decade ago then) but it does bring back memories.