EVS is probably the best way to travel around Europe and be productive at the same time.
You are going to a country for an extended period of time, ranging from one month to a year. There you will take part in a variety of projects, mostly as a project/workcamp leader and also you are making your own sie project. This can be almost everything (with reasonable limit) and this will probably by your main project during last EVS.
During your stay you will have a “mentor“, who will help you with many things. In short: you will do something amazing, meeting a lot of awesome people and having a lot of fun.