Looks like we'll be heading to Rotorua for a week in the Easter Holidays

Has anyone got any suggestions on what to do activity wise. We've got 3 kids in tow (aged 6, 4, 3) so I think that rules zorbing out, although my 3 year old is always up for a challenge

Ruled out Hells Gate have heard it's very expensive and we like to keep things cheap when the accommodation is costing us the earth.