PLAN being spontaneous is nice but sometimes a little planning can go a long way.
Planning a romantic getaway, a special dinner, or just a romantic thought makes a great impression because it shows you've done the extra leg work to make it a special moment. You can often find out what their likes are in terms of favorite colors, favorite restaurants, favorite flowers, and the types of trinkets they may like. Use all of that information to add to your romantic plans and you won't ever be sorry. Surprises are great because you get to see the expression on the other person's face and those expressions are often priceless. Being romantic doesn't have to be expensive, but there may be some things you'll need to spend a little money on.