In his early years, prior to having access to pools, Kawamoto used the Wailoa River for training, and Hilo Wharf and Radio Bay, just off the Eastern Hilo coast, where there is presently a yacht harbor, to hold swim meets.

He would take Hilo High School to several Hawaii Territorial State Championships but would have challenges winning consistently against powerful teams from Honolulu, such as Punahou.

Kawamoto told his swimmers there were three aspects to success; discipline, rigid training, and the "fighting spirit.

[8][1][9][10][11][12] Kawamoto retired from his job selling hardware at American Factors (AMFAC) in 1972 but continued coaching and conducting swimming classes for children.

He participated in the East Hawaii Kiwanis Club, the Kaumana Gardens Kumiai, as well as Hilo's Orchid Society.

Kawamoto received a citation from the County Board of Supervisors in 1956, and Honolulu Mayor Neil Blaisdell presented him with a civic award in the same year.

[8] Several hundred swim supporters signed a petition requesting the name change which was approved by the Hawaii County Council, and an official ceremony was held with Mayor Herbert Matayoshi on January 30, 1982 to unveil the sign designating the new name of the Swim Stadium.