We have two cats that we would love to take to a summer house with us for weekends during at least half of the year. The idea is that we'll be heading there on Friday and returning on either Sunday night or Monday morning. Both cats are very close to us and one of them would really miss us if we left him for two nights.
The house is not fully fenced and in my experience taking my more curious cat around, there's no fence that would stop him. The land around the house is around 600 m2 (6500 ft2) of grass and trees for them to play, and even though there's no fence there are plants that mark its limits.
Coming from the city that is a lot of land for them, however, last weekend, we took the more curious one over there (he's also the more adaptable) and he was already trespassing to neighbour's houses.
What can we do to keep them in our property? How can we teach them not to go far from us?