Hey Gam888,
We were in Yokohama back in 2019, sailing on Princess as well. IMO, a trip to Toyko is a bit rushed, since it is nearly an hr to get into the city via train. We stayed in Yokohama for a few days before embarking on our cruise. From the cruise terminal it is walking distance to Chinatown, Noodle Cup Museum (fun place), the red bricks warehouses (just shopping and eating). We also went to Sankeien Garden, a short bus ride away ( I think we caught the bus near Chinatown). Just some suggestions.Also, near the pier, there is a lovely park and promenade to walk along