Pay for half. Or say, I'll pay for the dinner, you pay for the drinks at the beginning of the night. You certainly don't want her to think that she can get free meals, activities, etc. from you, unless you want her to get that impression. On the other hand, you don't really want to look like you're avoiding paying. By doing what I said in a nonchalant and passing-by way you can a) not make a big deal of it, b) stay in control of the date in that sense and c) not end up forking over all your savings.