open a bank account at bank of america or HSBC/HBC. since america has their bank, you can get $$$ from USA or HK. NO charge when you get $$$ with your ATM or walk-in. YOU are not going to get any trouble or fake money at all! Check with their branch information at their website with the location you are going to go, then you can avoid alot of trouble with carrying $$ in your pocket and robbery,找換店? hard to find at USA, or you may get robbed outside of the 找換店.