Waihi Falls is a 25-metre waterfall in Waihi Falls Scenic Reserve, rated 4.6 from 343 Google reviews. The directory places it at Waihi, Hauraki, but the waterfalls website describing it gives access from Waihi Falls Road in Waione, about 1 to 1.5 hours' drive from Dannevirke, so check the location before you set out.
That site describes a fan-type waterfall reached by an easy walk of 15 to 20 minutes return to a viewing platform, then a descent to the base. The last 2km of road is gravel, and a big car park at the end has a picnic shelter, tables and toilets. The platform may suit wheelchairs, but the track to the base has stairs. Reviewers mention a steep, partly rough track and short gravel sections.
Waterfalls depend on rain, so after a dry spell the flow may be thin. Wear sturdy shoes and check the track conditions.
For a short walk to a quiet waterfall, Waihi Falls is worth the drive.