What to do
Drink! Half of Champagne's Champagne never makes it out of France, meaning you have access to countless small wineries that you'd never be able to taste otherwise. Better yet, those without names you'd recognize are likely to lure you in with a free sample, popping bottles until you buy one. (Or you don't, though it would be nice.)
If you're a planner, contact small wineries like Fallet Dart in advance to see if you can set up a tour with your tasting.
Some wineries will charge a nominal fee for tastings, which can then be applied to an (inexpensive) bottle purchase. Consider it an investment in your future.
Where to stay
Accommodations range from slightly better than a Route 66 drive-up motel to a tricked-out luxury chateaux that will give you serious money-making goals. (Not our fault if you return from Champagne eager to start a hedge fund.)
Though European hotel rooms are notoriously tiny, a three-star hotel room that sleeps four adults (you'll be dozy from all the sparkling wine, it's fine) under $100 is totally possible in the region. If you prefer to go the Airbnb route, expect to find plenty of industrious locals ready to rent out their tourist-friendly places to couples and solo travelers at less than the cost of a good bottle of Champagne, or roughly $50.