Congrats on finishing early!
Some things I would recommend from my personal experience:
--It's a double-edged sword, but I lived at home for as long as I could to save up extra cash. With today's insanely low interest rates and housing prices, it could make sense to buy. Sure, it was a little bit of a drag with dating (although my parents spent a majority of their time out of town, which helped), but it also helps weed out the women who are only looking to live in the here and now and are only focused on superficial things with big price tags, and aren't able/willing to sacrifice now for huge future benefits.
--Keep living simply. Don't be afraid to make use of things like Craigslist to buy used items if in good condition.
--Ignore the peer pressure and temptations from people that go out and blow $100/night on weekends at the bars, or buy a $35k sports car. Just keep picturing yourself at age 30 with a big ol' stash while they are still scrambling out of debt. You don't need to spend much money to have an extremely rich and satisfying life. In fact, often, the activities that truly build bonds and refresh the soul are those that don't have high price tags.
--If you want to pursue advanced degrees, look for options to pay it for free. For example, many universities/colleges give FREE classes to people who work there full/part time for so many years. Not to mention the various business that give some tuition credit.
--Just keep saving saving saving, and remember the power of compound interest. Sure, spend a little to keep things exciting, but it's unbelievable the power of being financially independent and not having worries about money.