MONDAY:
During your commute to work, listen to English podcasts that you find interesting OR read a magazine, novel or anything in English. (Obviously NOT during your commute if you are driving!)
TUESDAY:
Try to find an intercambio (a language exchange). Get together for some conversation over a coffee or a beer for an hour. You could do an hour of English and an hour of your native language to help them learn.
Meetup.com is a great resource for finding groups of people with similar interests. Or just look in the classifieds of a newspaper or online.
WEDNESDAY:
Sign up for a free course from livemocha.com. They have 4 courses that can help you improve all aspects of your English.
As you are a higher level they may be too basic for you but try the fourth course and see if it is appropriate.
THURSDAY:
Watch a movie in English or watch a TV episode in English. If this is too hard, which it with English subtitles as well.
If you have satellite TV, change all movies to the original version and watch them in English.
FRIDAY:
Review some grammar, phrasal verbs or idioms to help express yourself more naturally. Use a grammar text book or websites from the internet.
Try to choose phrasal verbs or idioms that are useful to you so that you will use them frequently.
SATURDAY:
Go out and see a movie in original version, then have another intercambio with a native speaker.
SUNDAY:
Relax, but try to think in English. :)
These are just some of many ideas to help you improve your English.
