Usually, date nights are meant for couples. At the root it is two people getting to know each other better, spending time together, and doing stuff they both enjoy. If you really look at the activities that go on during a date, they can all be done as an individual.
Go on a date with yourself. Take some time to get to know yourself. Think about your dreams, your desires, and your future. Go out and do the things that you enjoy doing. Do what ever you want to do. Go out, stay in, hang out with friends, go do what makes you happy. Enjoy yourself and be happy doing the things that make you happy. While doing all of this you will come to find out more about yourself. These activities should be your focus in your life. Don’t go looking for happiness. If you are doing things that make you happy, You are already there.