Ok so im leaving for paris tomorrow, and I still haven't decided what exactly im going to pack. I keep going between shoes. I know I need a good pair of walking shoes, but

I dont have any really comfy sneakers. I am for sure bringing one or two pairs of flip flops, and I want to bring my heels. So if I have room I will bring something else. I only packing a backpack for the trip, so I have limited space. What I decided for sure is:
three pairs of pants
three swim suits
10 shirts/tank tops
2 skirts
1 pair of beach shorts
I still need to fit my cameras, school books, travel guide, journal, ipod, reading books for the plane, shampoo, conditioner, etc. in my bag. So I am going to wait til tomorrow night to decide on the final packing list. I am also debating about what to wear on the plane. I know its a good idea to try to look nice, especially since I am going to upgrade to first class if there are seats available, but I dont know what to wear that looks nice and is comfortable. decisions, decision, Ill try to post my final packing list tomorrow night before I leave.