saguaro, cholla cacti, ocotillo and palo verde on a rocky mountainside at sus picnic area in saguaro national park

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 cholla boulders pima county sus picnic area palo verde ocotillo mountainside