Wildfoods Festival, [1]. Annual food festival displaying foods that range from the begnin, to the absolute wildest (paua titties (roe), bull, lamb and goat testicles) you could consider.
Visit the glowworm cave.
Carve some jade.
The cheapest way to get to Hokitika is with nakedbus.com with fares starting at $1. Intercity Coachlines also travel there.
Hand blown glass. Watch them make beautiful pieces of glass and then make a few purchases at the Hokitika Glass Works.