Things to Do in Oahu in 2026 – Tours & Activities | HawaiiActivities.com Visit the Byodo-In Temple, located deep in the heart of Oahu's Valley of the Temples, and experience the peaceful serenity of this non-denominational Japanese shrine commemorating the first Japanese immigrants who arrived in Hawaii over a century ago. This replica of a 900 year old ancient Buddhist temple in Kyoto, Japan is tucked at the base of the Koolau Mountains and is set upon beautiful acres of koi ponds and Japanese botanical gardens.