Lil Jon looked back on his last trip with his late son Nathan Smith in an emotional social media upload. In the clip, the father-son pair took on Japan, trying out various foods, exploring shopping malls, modeling traditional garb, checking out the Fuji Speedway, and even sketching anime characters, among other activities. The rapper noted in the caption that he’d asked Nathan — who went by DJ Young Slade — what he wanted to do for his birthday two years ago. Lil Jon wrote he wanted to “go to Japan.” “I had no idea that trip would become our final father-and-son trip… or his favorite one ever,” the “Get Low” hitmaker continued in part. “We did everything—from museums and food tours to Michelin-star sushi spots. We even watched samurai swords being forged… and got to use them.” Lil Jon looked back on his “final” trip with son Nathan in an emotional social media post (above.) Lil Jon/Instagram The rapper noted that he and late son Nathan spent time together in Japan for his birthday.…