There seems to be a machlokes between Rav Shteinman and Rav Chaim Kanievsky about when people should start their vacations, specifically travelling around the country to go camping or stay in hotels and cottages...

Ladaat quotes Rav Shteinman as saying that people should not go away for vacation - the yetzer ha'ra does not take vacation, so anybody who can do without it, should. As well, if going out, people should be very careful about safety. People say it wont happen to them, but there are many accidents and tragedies that happen with water. He says the Chazon ish says the sea is important and was created for those who learn Torah, but the Chazon Ish never said one must go in to the water.  Also, he would say the benefit of going to the sea is for up to 10 minutes - beyond that adds nothing. Rav Shteinman said that when his kids were young he would take them on vacation to visit the Kotel and to visit the grave of Rabbi Shimon bar Yochai in Meron.

Kikar quotes Rav Kanievsky as saying that people should not go away on vacation until after 15 Av. His rationale is that Shulchan Aruch says when the month of Av is brought in, one should minimize his simcha. This applies, Rav Kanievsky says, until the 15th of Av. As well as vacations, one should avoid renovations on his house until 15 Av as well as buying real estate.

15 AV is today, so from now you can enjoy your vacation... unless you hold like Rav Shteinman...