I visited Denver several years ago.  I loved going to Garden of th Gods and walking around.  It was beautiful.
what plants are there and which one did you love most
It is actually a garden of sandstone rock formations in Colorado Springs.  Pike's Peak is in the background.
good to walk barefeet durring summer right?
There are foot paths through the park and nature trails, but I think they would be too rough for walking without shoes of some sort.
so what time is best to go visit
Probably in the warmer months when the trails are open and you can opt for a horseback tour.
how much do they charge for that
I believe you would have to call the park office to find out how much the hour rides are.
will try that out thank you for the new area lesson