If its for getting off auto, find a local who’s doing one day courses where you have maybe 6 – 8 people max. You should learn all you need to know to start getting the images you want. We have a local chap that does a number (South Leicester based): Beginner, Intermediate, macro, flash, portraits, night, birds, big cats etc.
If you’re more experienced and its a particular genre you’re after look for workshops – especially residential if you can afford it. For example for Landscapes someone like Light and Land have a number of courses from 1 day to weeks away. A lot of good pro photographers will run workshops and you can book on their websites. Even better if you can afford a 1:1 day, you learn a significant amount!
Not long back from 10 days with Joe Cornish & David Ward, learned a stupid amount in that time. They also know good locations to take you to for inspiration.
Having been on (I went as a friend wanted to go) one of the groupon things, we found there were 40 people, some with iPhones through to high end DSLR’s. Avoid big groups like this like the plague, if you are looking at groupon check how many participants there will be and what the course structure is!