Prepare a sumptuous meal. The first step to a man's heart is to know how to fill his stomach
Give him a relaxing and soothing massage
Brush or comb his hair
Soak together with him. Bathe and scrub him
Don't buy a card, rather make it yourself (& it works).
Tell him how much you loved him.
Get him the sensuous and sexy briefs you want him to wear all along.
Break the convention. Take him out for a meal. Pay for the meal as of course
Exchange a list containing each other's likes and dislikes.
Start saving for a special holiday fund for the two of you
Just take time out to express your feelings, thoughts, fears and even fantasies to him..
Give him a kiss on his cheek.
Get him the cologne you like him to wear.
Take a long walk holding each other's hands.
Do something together. eg fix a jigsaw puzzle or play a game together etc
Wear the lingerie the he likes the most even if it's not your favorite
Get him a watch.
Kiss and Hug her often.
Write a sincere, wonderful love letter.
Buy a nice set of lingerie and briefs. Let him choose the lingerie for you.
Take him out for a scroll.
Surprise him with gifts. Guys not only girls need surprises at times too.
Take him out for a long romantic drive.
Decorate the house especially for him.
List down twenty-five things that you like about him and fifty things that you don't like.
Visit a place where he always wanted to go, but never got the chance.
And finally, whatever you do, just let your hair and your defenses down, and enjoy each other's company.
Sure you can think of many more romantic tips to show your love - this should give you some good ideas!