Check the web site for current opening times, when we visited in June 2014, it was 1pm to 3pm. There is no fee but there is a donation box and mementos (t-shirts, fridge magnets etc) for sale. The staff are happy for you to take your own treats along for the cats. Despite the fact that they’re obviously well fed, we quickly had half a dozen friendly cats sitting at our feet munching the cheese flavour Dreamies we’d taken with us. The sign in the boat isn’t that big and could be easily missed so I imagine (although we didn’t try this) that it would be easier to spot the boat from the other bank where you’d see the mesh enclosed cat run on that side of the boat. It’s not your typical tourist attraction but if you’re a cat lover then it should definitely be on your list.