rocky, desert mountain top covered in saguaro, cholla cacti, ocotillo and palo verde at sus picnic area in tucson, arizona

saguaro national park tucson mountain district arizona usa botany nature cacti vegetation outdoors spring landscape desert tourism travel adventure vacation sight solitude peaceful creosote bushes hiking harsh environment ecosystem rugged mountains bucket list west america rocky top blue sky wispy clouds carnegiea gigantea ocotilla fouquieria splendens prickly pear opuntia cholla boulders pima county sus picnic area palo verde dying decaying covered ocotillo