I hate to say it because I am not a materialistic kind of a person, but more money would definitely make me happy. Trying to take care of a family on one income is extremely stressful these days. There are so many things to pay for that just didn't exist a couple of generations ago, like cable or satellite TV and cell phones. Then there are all those unexpected bills, like bills for unexpected illnesses. If I had more money, I could do things to my house to make it cost less to run, such as installing a geothermal heating and cooling system, instead of using expensive oil heat.
Good health and enough money not to be stressed out would make me very happy. I also enjoyed all the travelling I did as a young lad, and wish I could pursue travelling again, as it made me very happy.