In the United States, unofficially, "summer" begins with the Memorial Day weekend and ends with Labor Day weekend. Memorial Day is the last Monday of May, Labor Day is the first Monday of September. If you get those days off from work, they are both three-day weekends. 

In the U.S. workers tend to get short vacations--in many cases only two weeks, and it's rare to get more than three weeks. People take their vacations at different times, but it is common to take them during the summer. 

I can't say what we "usually" do, it's something we think about every year. We are currently retired, and this summer we spent nine weeks on a road trip, camping some  places and staying at motels some nights. We visited friends, and saw Badlands National Park, Devils Tower National Monument, Custer State Park, Yellowstone National Park, and Theodore Roosevelt National Park. It was wonderful to be retired and have the time to do it.

In the U.S. it's common for families to take road trips and visit some of the national parks, but it's something my wife and I missed out on as kids and it was great to finally do it.