Ideas of what gifts work well to make a girlfriend/wife feel special.
A vacation. Especially if the two of you have been working hard this can be important.
Going out to a restaurant. While not all women are cooks anymore those who are can really appreciate a night off.
Jewelry. Some women really enjoy being able to show off how much money their partner is willing to spend on them.
Flowers. These may seem a simple gift but they can be very important as they show thoughtfulness and the color/ smell can enchant your mate.
Help around the house. While your wife may not be the one who always does the work around the house if she is she will likely appreciate your helping out.
Taking care of the children. While the roles have changed women often still are the primary caregivers and support in their struggles and some time off from the mothering role can be lifesavers.
Your companionship. If you are someone who works long hours it can be draining on the relationship. Men who work all the time can have trouble attracting mates. There is a good reason for this - women want the company not simply the money.
If you don't know how to laugh then learn how. Life can be too serious sometimes and it helps if you can break the tension with humor. There are many times of humor. The more filled with joy and wonder it is rather than bitterness or putting others down the more she will enjoy it.
Clothing that flatters her appearance. This shows that you notice her looks and appreciate them. A subtle perfume could have a similar effect.
If you can afford it the house or car that she dreams of can be make quite a difference
Favors such as getting her car serviced, the house fixed up and other such things are also quite important
Think of your own ideas whether it is a kind word in a moment she feels sad, helping her figure out a solution to her own or her friend's problems, or whatever else it may be.