Writing a note or letter to tell him or her your love is the quintessential way to express yourself in today's electronic world.
Nothing beats an old aged piece of paper with words of love or poetry on it.
Get a good pen, preferably a fountain pen and write in cursive on good quality paper. When you're done, roll it up and tie it with a pink, red or purple ribbon. If you can't find a ribbon, improvise. Or put the letter into an envelope and seal it with a kiss. You can add a few drops of your favourite perfume in, or something unique that will identify the letter with you.