I've been in your shoes three times, and I approached each situation, the same way. Each time, I felt like a gift was too much, too soon; so I thought about what type of person she was, and our past conversations, then catered an evening to them.
The first girl, mentioned how much she loved shark week, a few times, so I took her to the Georgia Aquarium, and then we hit up a nice restaurant. The second chick was really into Jazz, so I cooked an early dinner, and took her to a jazz club(cafe 290). The third girl was only 20, so I took her to Six Flags, and then hit up Atlantic Station, later in the night.
Some might think I was tripping, but I like having a good time, and I didn't break the bank. That was all stuff I would've done sans them anyway so, it's a win win in my book.