Rav Shlomo Zalman Auerbach: Vacationing in Chutz La'Aretz
The Mishna Brura (631:14) says that one may only leave Eretz Yisroel for a Dvar Mitzva. Included in this, he says, is earning money and visiting a friend. However leaving Eretz Yisroel for the purpose of touring and sightseeing is prohibited.
Rav Shlomo Zalman was asked if someone from Eretz Yisroel who is going to visit his grandmother in France may tour the country while there, since he went for the purpose of a mitzva. Rav Shlomo Zalman told him that he may tour France but he should not go to any other countries in Europe. (Aleihu Lo Yibol OC 304)
Disclaimer: We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. Please also understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.