If you want to spend a romantic night with your girlfriend you could try to find a nice field or a place in the mountains.
Of course, you will need something to lie on and something to cover yourself with. You can take few pillows and nice thick blankets and stay out under the stars. Just do it and believe me you will not forget about this night. It will be one of the best romantic nights of your life. You can take some wine with you and then use your imagination.

Don't put aside anything what brings laugh and joy to your life.