Cane and Ty are to young to walk around yet. However, Sadie is 8 inches so when we clean her tank, she gets to wander all over the house. And she knows the floor plan very, very well. She even still goes to where her old 40 gallon used to be and looks for it, not because it was a good house but because it belonged to her for so many years with her previous owner. If I am at the house alone, I will shut my mother's bedroom door because it's hard to get Sadie out from under the bed, and, whenever I do this Sadie will scratch at the door and try to push it open! She loves to run around outside in the grass, too.
We don't watch Sadie as closely as other turtle parents because our cat, Spike, follows her everywhere. So, we don't have to find her, we just have to find him. She is about half his size, he's a tiny cat, so, he's not aggressive with her, and, she's not even remotely afraid of him. He just has a strange fascination with her, but can't be near the smaller turtles because he tries to swat at them. Another cat of ours, Jenny, is probably the gentlest soul on the planet and I would trust her around any small animal, even mice. Clementine on the other hand... She tends to hiss and growl at Sadie, and tries to be aggressive towards her, so, Sadie will in turn charge at her and chase her around the kitchen. I love the way a huge cat like Clementine can get owned by a turtle in a matter of moments. It's great fun

Edit: I once showed Typhoon to Jenny, and in response, Jenny head rubbed Typhoon and purred like she was accepting Typhoon as family. It was adorable. Gentlest soul, I tell ya.
Phryne - Japanese bobtail, 11 y.o.
Hurricane - RES, approx. 19 y.o., 7.00in. long
Typhoon - RES hybrid, approx. 19 y.o., 8 in. long
Sadie - RES, approx. 30+ y.o., 11.5in. long
Sophie - Colombian red tail boa, 15 y.o., 5 ft. long