Go early. The temple opens in the morning and closes in the afternoon — earlier than most visitor attractions, which catches people out who plan it as an end-of-day stop. Tour vans running the circle-island route arrive mid-morning and leave in clusters, so the first hour after opening and the last hour before closing are the quiet windows.
Verify the closing time before you drive over. It has been revised, and a listing that was right two years ago may not be right now. The same goes for the admission charge, which is modest but real.
Weather. This is the wet side of the Koʻolau. Kāneʻohe and the valleys behind it are among the rainiest inhabited places on Oʻahu, and a shower at Byodo-In is a normal event rather than a ruined visit — the pali looks better wet, the waterfalls only exist when it rains, and the ponds are unbothered. Bring a light layer. There is shelter at the bell pavilion and inside the temple.
Budget forty-five minutes to an hour and a half. Fifteen minutes is enough to take the photograph and leave, and that is what most visitors do, and they get considerably less out of it than the person who sits down.
Where it fits. Kāneʻohe is on the windward coast, south of Kualoa and well south of the North Shore proper. A sensible anticlockwise loop is Byodo-In first thing, Kualoa mid-morning, lunch at Kahuku, and the North Shore in the afternoon.