Depending on your age, your situation and your motivation (school, professional or leisure), you can choose the length of stay to suit you, from a week to several months : total immersion in a host family, sports or cultural activities, or language classes and excursions attended by young people of various nationalities.
Check the price: these types of package have a price tag which can be very high in some cases. Also read the travel and level of language immersion conditions carefully.
Remember the travel cost can be expensive and the opportunity to learn the language may be limited if you find yourselves surrounded by others speaking your own language.
There are myriad organisations offering language holidays in a number of different formats.