Your 20s is a transition decade. This is the time to take stock of your life and figure out what you want to get out of it. You will probably find out that your dreams and aspirations from childhood probably don't apply anymore now that you have matured and most likely you haven't fully figured out what you truly want just yet. Do it now so you can plan and more importantly establish habits and routines that will serve you the rest of your life. 

Adventure - If there is any wild crazy things that you have always wanted to do then do it now and get it out of your system. You will never have more energy and freedom than you do right now so take advantage so that you don't regret it later or screw up your life with some mid life crisis down the road. 

Money - You are 25 and don't have any but now is the time to establish budgets and good habits in spending and saving. Avoid debt like the plague. 

Health - The warranty on your body runs out when you hit 35. Start eating better and ingrain the habit of exercise now. Don't go overboard trying to get huge, massively strong, or run 100s of miles at a time. You will love it now but you will pay for it later in life through your joints and nagging injuries. 

Family - This is the time in life where you discover that you can choose who is your family from the people in your life and not just by blood. Cultivate friends and relationships. Hang on to the people who are important to you because they start disappearing from neglect in time. 

Career - now is the time to lay out the beginning of your work and career life. You are going to be thrown curve balls so stay flexible. If a job makes you miserable then change it now. No reason to be bitter and unhappy for years when you have the power to undo it now.