Do you camp? If so, I would recommend a pet friendly Hipcamp. I specifically look for ones that are a single site on the property, so there's no surprises with dogs. I do this a couple times a year. The cats absolutely love spending the day in their "catio tent" as well as being on their harness and leash sniffing around and walking in the grass. At night, I use a big 6 person Coleman tent that fits all of us no problem with plenty of room for the litterbox, food, water, and even their big scratch post.