If you are interested in caving, the Wellington Caving Group (WCG) is running a beginners day trip on Sunday March 27th, to two caves in the Wairarapa, Bathtub and Flavels, near Mt Bruce
More info on the trip and intro night here:
http://caving.wellington.net.nz/pmwiki/pmwiki.php/Events/NewMembersNight
Caving is great fun, you have a perfect reason to get really dirty and play in the mud and you can see awesome formations.
Try it out,
Katja