Tour Options, Barcelona
I arrived by train from Madrid. Barcelona is connected by train with many majors cities in Spain and the surrounding countries.
You may use the BARCELONA BUS TURISTICO. It´s a bus that runs two different circuits. You may get in and down from the bus as many times as you want during the day you purchase your ticket. It stops in all the interesting places in town.
There are 5 Metro (sub-way) lines, and within connections you may go everywhere you want to.
I used the South Europe Flexible 5 Days Railway Pass to travel around in Spain, France & Swiss, it is very convenient.
Touist Bus no. 100 goes all the attractive points, you can almost visit the whole town without leave the bus.
The tour bus is a great way to see the overview of the city for the entire day. I think it was a great bargain!