oooh a newbie USA visitor, you are just going to love every minute of the adventure.
Im off the California in a few weeks and I have planned my shopping day too. Hot Topic is my favourite shop, there is just sooo much I want to buy there, I wish they had a UK / Irish shop.
Walmart is an experience too. I buy Ranch Dressing to bring home. Be warned though American chocolate is very different, even if it looks like the same as ours. I always bring Irish chocolate with me. Target is more like Tesco or Sainsburys, where as Walmart is more like Co Op or Morrisons. American people will go to Target before Walmart, and will look at you odd when you want to go to Walmart, lol. My American friends think it hilarious that I ask them to bring me there
Sephora is amazing, you will just get lost in there, might be an idea to sent your boyfriend somewhere to wait for you, lol, maybe in The Apple Store if there is one or J Crew Mens shop
Bath and Body Works is kinda like The Body shop. Other shops I usually go to are Victoria Secret / Pink, Abercrombie, Icing (similar to Claires) Forever 21 , American Girl,
The main department stores are Macys and Nordstrom. Some places also have a branch of Barneys and Bloomingdales. If you like cheap and cheerful Primark, the American version is JC Pennys, cheap and cheerful shoes can be found in Payless. For runners shopping check out Sketchers, Vans and Converse.
Theres lots more but thats all I can think of right now