Plan a candle light diner and movie. Take her for a walk on the beach or through the woods. Write her a poem, even if it doesn't rhyme, she'll love it. Draw her a picture, even if you can't draw, she'll love it. Plant a tree somewhere together so you can always remember that day by going to the tree. Good luck and have fun.
Write her a poem or sing a song. Buy her a small cute pumpkin or squash for Hallowe'en. Make toffee at home using melted sugar in a pot on the stove. Stir with a wooden spoon to keep it from burning. Do not taste the spoon as it will burn your tongue badly. Carmel is a lot hotter then water when heated. Press a blob of caramel on a wooden cutting board to make a sucker on a stick or curl caramel on a stick and cool in water. Pretty cheap ideas and sweet. Wash and comb her hair and add a bit of neck & shoulder massage....they love it!