“The Satmar Rebbe hold that one keeps one day of Yom Tov in Israel, even if you are only a visitor”
The Lubavitcher Rebbe also supported going by where you are. I think there are different girsas on how the Baal HaTanya held… Gah, there I go again; exposing myself as a secret Lubavitcher. I haven’t really observed people travelling enough to know, but maybe it’s the standard Chassidishe minhag.