Go underground. Explore the hundreds of metres of underground passageways at the Waipu Caves. The main cave (about 175 metres long) has one of the longest stalagmites in NZ and you might spot a glow worm, or three. From Waipu, head north about 16km and you’ll find the passageways within the Waipu Caves. If you want to experience how the professionals do it, check out Peak Adventures who can be your local guide, or go underground yourself.