Recalling romantic site
Wedding ceremony in Valentine Day of course must be romantic enough. So you may choose some places which have sweet memory of you, let me say, skifield, a tourist resort or some places you two have been to.
Romantic color
Pink, scarlet, red are the main color in this special Day. You could choose these colors for your ceremony, or just like some faddish couples, you could use black and white as the keynote and red or pink as the interspersion.
Special invitation
If your ceremony is not that formal, then you could send Valentine cards as the wedding invitation, so using valentine cards as visitor's book.
More accessories
Colors are important to determine the main styles, yet different accessories will enhance romance. For example, smooth silk tablecloth matched with candles will surely make the venues homey and sweet. So prepare more little decorations or accessories, you will get a more romantic ceremony easily.