HI:

WHAT IS THE BEST WAY TO OBTAIN TICKETS FROM HONG KONG TO SHENZHEN? SHOULD I PURCHASE THEM HERE IN THE US OR CAN I PURCHASE THEM AT THE TRAIN SUBWAY STATION. IS THE FARE THE SAME SHOULD I PURCHASE THEM ONE WAY AS IF I GET THEM ROUND TRIP. I LIVE IN LOS ANGELES CALIFORNIA. WOULD IT BE BETTER TO PURCHASE THEM HERE BEFORE I LEAVE? IF SO WHERE DO I GO TO ACQUIRE PASSAGE? IF I GET THEM IN CHINA HOW LONG WILL IT TAKE TO MAKE THE PURCHASE? HOW FAR IN ADVANCE SHOULD I GET THERE? I PLAN TO TAKE THE SUBWAY THE SAME DAY AS I ARRIVE IN HONG KONG.

IS THERE ANYTHING ELSE I SHOULD KNOW OF IMPORTANCE? THANK YOU