Every summer, Americans flock to lake homes, beach cottages, and other regular retreats for rest and relaxation. But it's also a good time to venture somewhere new, from camping in a national park to a five-star stay at one of Mexico's all-inclusive resorts. Here are some tips for enjoying summer’s most popular destinations.

Europe

Usually agreeable summertime weather makes Europe a hot spot for history and sight seekers. Italy is especially popular this year, according to travel agents. If you plan to visit holy sites in Italy, such as the Vatican, be sure to have appropriate clothing. This means no shorts, and women should have a sweater to wear over sleeveless shirts or dresses.

Cruises

Summertime cruises make it easier to see many destinations in one vacation, especially to northern climates. Exploring the glaciers and wilderness of Alaska -- and basking in never-ending days of sunlight -- has become a favorite and affordable summertime trip. If you want to stay near the Denali National Park entrance, be sure to book early. Rooms are limited, and July and August fill up fast.

National Parks

The nation’s network of national parks is most busy in the summertime; some of the most popular are Yellowstone, Yosemite, Glacier and Grand Canyon National Parks. But don’t forget Washington, D.C., which always attracts throngs of families and tour groups all summer long. Washington, D.C. can be very hot and humid in the summer, so make sure your hotel has a pool.

Theme Parks

When theme parks are mentioned, most of us tend to think of that famous one in Orlando, Fla., and rightfully so. If you’re planning a trip to Orlando, remember that Florida summers are very hot, so be sure to drink a lot of water. Most theme parks allow you to buy tickets online, in advance, which will save you from standing in at least one line.