The business' accommodation block, which can house 100 guests, had flooded and all horse treks had been cancelled until further notice - at one of the busiest times of the year.
Mr Heywood said clearing the tracks would be the first priority so the treks could begin again, which he hoped would be in about two weeks.
Mr Heywood, who was thrown 60m by the twister, said he was still feeling the effects and was unable to hear out of one ear. After refusing to go to hospital on Thursday, he would be getting checked out today, he said.
Mr Heywood's wife, Wendy Branch, said it had been an emotional and sleepless few days, not helped by another thunderstorm on Saturday night.
"The sky went black. It freaked me out," she said. "In your mind you know it's not going to happen again but in your heart you're [terrified]."
Ms Branch said they owed a big thank you to neighbours, firefighters and a policeman who stayed with her and their children on Thursday night, when they were unable to get back to the farm. She was also grateful to vets from VETPlus who made their way to the farm on Thursday afternoon, despite the road being blocked by fallen trees. "They were here like an army, trying to help everybody."
Mr Heywood said they were still figuring out the best way to move the trees, although he was considering leaving some in place.
"At least it will give them [the guides] something to talk about to visitors when they're on treks."
After last week's heavy weather, MetService is forecasting mainly fine days with highs up to 23C for Rotorua this week.