Cook a meal. If she normally does the cooking, learn how to make something well and then make it for her.
Not only will she appreciate not having to cook for a change, she'll appreciate the effort you put into it just for her. (Need a little help? Check out Amazon's cookbooks for men.)
Give her a compliment. Don't just say, "You look great Honey." Be specific. Notice her shoes or her hair. This will let her know that you're paying attention.
Write your feelings down in a card, or on any scrap of paper for that matter. Women love it when a man takes the time to articulate his feelings and put them in writing.
Pay attention to things she says or notices, like when watching TV or shopping or out walking. If she says something like, "Oh, I've always loved Picasso," file that away in your brain and then surprise her sometime with a small Picasso-themed gift. This, too, will tell her that you are bothering to learn about her and then acting on what you learn.
Take her in your arms in the middle of the day for no reason and kiss her passionately.
Send her flowers to her at work. All her female co-workers will be envious!
Give her a massage or foot rub.
Take her for a walk at night when the moon is full, or if you live in the city, take a drive away from city lights to where you can see the stars and go for a walk.
Send her a silly ecard.
Rent a classic romantic movie you know she likes, (we don't
mind seeing the same great romantic movie over and over!)
make some popcorn, put a blindfold on her and lead her to the
couch.
Serve her breakfast in bed.
If she's going on a business trip, hide love notes in her
suitcase.
Surprise her at work by taking her out for lunch.
Dedicate a song on the radio to her.
When she's taking a shower, write "I Love You" on the
steamed-up mirror.
Remember the day you first met, or the day you first kissed,
or some other 'first' in your relationship and celebrate that
anniversary by taking her out to dinner.
Slowly kiss her neck.
Make her some mouth-watering chocolate covered strawberries. How? Melt
chocolate chips in the microwave, stir, dip in strawberries
with stems still attached, arrange on wax paper, refrigerate,
done! Then feed the first one to her.
The next time you go to a movie, take her to the back row and make out.
Fill the tub with hot water and bubbles and invite her to join you.
Pack a cooler or picnic basket with yummy food and take her on a picnic.
If you have kids, come home early to do a little housecleaning, cook dinner, and take care of the kids, so she won't have to do anything when she comes home from work. Okay, so this romantic gesture is a lot of work, but she will really appreciate it.