"That's one thing that shocked me, all the signs were in English. Considering New Zealand's history is about that bi-cultural partnership, I was quite shocked," he said.
Despite the new entry fee for the Treaty Grounds, Mr McManus said they had been busier than usual this summer, the new features may be the cause.
He said it was "great" to have some of the project completed in time for Waitangi Day, which will mark 175 years since the Treaty was signed.
"I would have loved for the museum to be completed too but it's a massive job."
Mr McManus said the 175th Anniversary will be a "massive day".
"The navy will be sending five ships, they usually only send one, and we think the airforce will be flying past which they haven't done in years," he said.