It's in your best interest to find something really inexpensive to do.
Here's why:
Spending a lot of money on the first date will make it more difficult to impress him/her later on.
Have easier anniversaries
It can be hard to distinguish feelings at times, so it's always helpful to remove confusing factors like finances.
If the first date with your wife was a $150 dinner, that can be a costly event to re-create when you have 4 kids. But if you went on a picnic or met at a small cafe, it's easy to relive that special moment.