I was in Port Macquarie last year, and it's pretty easy to get around with a regular taxi there. Around 1:00 p.m., it's easy to find a car, even with suitcases, especially around the hotel and main streets. Prices aren't as high as in Sydney or Melbourne. But I'd still recommend booking a taxi in advance. If I were you, I would look at the options on the GetTransfer website
https://gettransfer.com/en/directions/australia/port-macquarie . There you can book a transfer for the desired day and time, and the price will be fixed. But you can try your luck and look for a taxi on the spot. Usually, short trips to the center, beaches, or cafes cost between $10 and $20, and slightly longer trips cost between $25 and $35. It all depends on the distance and traffic. For example, if it's rush hour, be prepared for the price to be higher, or when there is heavy rain, for example.