Coffee
who doesn't like some hot coffee after getting drenched in rain. It makes you feel comfortable and relaxed. Having coffee with someone you love after rain is bliss. Give it a try.
Walk
Holding hand walking down the road with nothing on your mind makes your bond stronger. It helps you connect better. Drop your umbrella and embrace the rain.
Movie
Had spent day in rain? It's time for movie now. Theater AC can play wonders for you. It will bring you close than you can imagine. Also there are chances of cold and shivering (use with caution)
Calls
Looking at rain from your window and calling her just to say 'she is more beautiful than this rain and air'. It just brings out the most romantic manic inside you.
Drive
Driving in the rain with your partner is as good as sharing most memorable moments of your life. Go out. Take leap of faith with her. Don't worry about traffic. As far as she is with you traffic is just a way to spend more time with her.