For analysts, the Lions rugby tour next year, the possible effects of Brexit and an increase in tourism from China could all be contributing factors to its plans.
New Zealand and the US contributed strongly to the result.
For its full year to June, revenue was up 18% to $279million, earnings before interest and tax grew 20% to $38.7million and after-tax profit was up 21% to $24.4million.
The dividend for the full year was up 27% to 19c per share. THL's total borrowings had risen from $75.7million a year ago to $82million.
THL chairman Rob Campbell said the company had promised revenue growth and was achieving it, without any loss in focus on returns on funds.
''The year's result is good, but far from faultless, providing more upside in the coming years,'' he said.
Mr Campbell said while THL had not given any guidance for the full year 2017, it remained focused on reaching the $30 million after-tax profit target in full-year 2018, announced earlier this year.
Craigs Investment Partners broker Peter McIntyre said the result was ''broadly in line'' with expectations, noting July's trading results were positive and forward summer bookings were ''encouraging''.
''We don't expect to make material changes to our projections,'' Mr McIntyre said.
However, he said Craigs' current after-tax profit forecast for 2018 of $28.5million was 5% shy of management guidance.
Mr McIntyre said he expected lower inbound arrivals from the UK, given the ''twin impact'' of a higher exchange rate, making it more expensive for UK residents to travel overseas, and a possible dent to consumer confidence because of Brexit.
Forsyth Barr broker Suzanne Kinnaird said the ''strong'' result was also broadly in line with expectations, the 21% profit boost boost driven operationally by NZ rentals and the tourism group, and supported by further US growth and some currency benefits from a weaker New Zealand dollar.
''Earnings at THL remain on an upward trajectory,'' she said.
Full years 2017 and 2018 would both be supported by increased demand during the Lions tour of New Zealand in June/July next year.
''While Brexit poses a risk to an important source market for THL, we anticipate growth from other-origin countries, including China, more than compensating,'' she said.
Chairman Mr Campbell said ''greater clarity'' on profit expectations would be provided at the October annual shareholders' meeting.
By then, the US and UK high seasons would be complete and a greater proportion of the high-season bookings for New Zealand and Australia would have been completed, he said.
