12/19過午退房之後我們往南去土桑，就在快到旅館前車胎警示燈亮了，我們剛好就在我們車胎行的連鎖店附近，檢查之後發現有壓到一個鐵片必須換胎，所以Bo換成備胎，把車胎留下來明天再來領回去。這一拖到了旅館天色已晚，我們簡單的吃晚餐後就休息了。After checking out at noon on 12/19, we headed south to Tucson. Just before arriving at the hotel, the tire warning light came on. We happened to be near the chain store of our tire dealer. After checking, we found that a piece of metal was sliced in and we had to change the tire, so Bo changed into a spare tire and kept the tire and came back tomorrow to get it back. It was too late when we arrived at the hotel, so we took a rest after a simple dinner.
12/20吃完豐盛早餐之後先去領回新的車胎，我們往南開去參觀一下冷戰時期的地下核子發射基地。12/20 After a hearty breakfast, we went to pick up new tires, and we drove south to visit Titan Missile Museum, the underground nuclear launch base during the Cold War.
之後我們再往南到了美墨邊界。諾加利斯（英語：Nogales）位於美國亞利桑那州南部的美墨邊界上，是聖克魯斯縣的縣治所在。美國與墨西哥的諾加萊斯相鄰，兩者的鎮名具有相同的字母拼法。我們簡單的吃了非常道地的Taco！往回開時看到非常美麗的夕陽。回到旅館附近走走看夜景。Then we went further south to the US-Mexico border. Nogales is the county seat of Santa Cruz County in southern Arizona, on the U.S.-Mexico border. The United States is bordered by Nogales, Mexico, and the two towns share the same spelling. We simply ate a very authentic Taco! When driving back, I saw a very beautiful sunset. Go back to the hotel and walk around to see the night view.
12/21一早Bo去騎車，我去旅館附近的步道走走，看看我們最喜歡的巨人柱仙人掌和瀑布。晚上吃了牛排和Pizza！On 12/21, Bo went for a ride in the morning, and I went for a walk on the trail near the hotel to see our favorite giant saguaro and waterfall. Had steak and pizza tonight!
12/22早上吃完早餐後，我們往西北方向移動，傍晚到達棕櫚泉，Bo去附近騎車。12/22 After breakfast in the morning, we moved to the northwest, arrived in Palm Springs in the evening, and Bo went for a bike ride nearby.
