Although Think! is primarily a British government website aimed at teens concerning road education, I think the contents will be interesting for everyone. You can play a game showing you are smart enough to manage time and attitude to reach a place safely, investigate an accident and find out what shouldn’t have been done. On top of that, if you visit the site with an English-speaking friend you can engage in conversation and discuss all the issues there. There's also room for writing your own suggestions. If you work on your own, the main skill you will be practising will be reading, but in the 'Media and advertising' section there are some ads with which you can practise your listening skills. Overall, Think! is an excellent site for language intermediate learners which also provides great education for life.