Chief executive Fergus Brown said members' business confidence was high.
"Most trade exhibitors at the conference reported roaring business, with park operators keen to upgrade their facilities before summer," he said.
"But we're also reminding our members to look after themselves, and take this opportunity to have a break and recharge their batteries."
Freedom camping remained an issue of concern to holiday parks, Mr Brown said. HAPNZ opposes freedom camping being permitted in urban areas or close to commercial holiday parks, and made submissions on 11 freedom camping bylaws in the last year.
HAPNZ is a strong supporter of the New Zealand Responsible Camping Forum which is led by Tourism Industry Aotearoa and includes representatives from rental vehicle operators, councils and other interested organisations.
Key facts:
• The holiday park sector provides 36% of New Zealand's commercial accommodation capacity and 19% of commercial guest nights
• In the year ended December 2015 holiday parks provided 7,024,063 guest nights
• Guest nights to holiday parks are made up of 32% international visitors and 68% domestic visitors
• While staying at holiday parks guests contribute over $1 billion in direct expenditure to local communities
• Approximately $612 million (60%) of the expenditure is contributed by domestic travellers, with the balance of $405 million (40%) by international travellers.
• Expenditure by international visitors contributes directly to New Zealand's export earnings.