Help! Need ideas.

Help! Need ideas.

My mate and I are doing a quickie 5 day trip to South Island to swim with the seals, white water raft and quads in the mud. That's 2 days. Need to fill in another 2 days and also find a great pub to watch the NRL Grand Final at! Any ideas?

Question about South Island

Black water rafting? (white water rafting in caves) or caving?