Honomu is just a 15 minute drive North up the coast from our house and is on the way to Akaka Falls State Park (another 5 minutes from Honomu). The village (of about 500) itself is a nice place to grab some ice cream or lunch and then check out the Buddhist temple and the huge banyan tree.
In June of every year, the Honomu Henjoji Mission holds its annual O-Bon dance (2011 announcement, 2012 announcement, check the community news section of the Hawaii Tribune Herald in June to find details). . As the article from 2011 states:
Japanese immigrants brought many traditions to Hawaii. One of them is the annual O-Bon festival season running from June through August with ceremonies honoring ancestors.
That would make a nice afternoon, go for some ice cream, walk the falls trail and then return to Honomu for the dance.
(this post was edited and reposted to make it less ‘year sensitive’)