There are a lots of possibilities to moving around Barcelona with out a travel guide. I suggest the best way of doing
Barcelona day trip is through the Barcelona city Card. The Barcelona City Card offers free entries to many of Barcelona's major attractions, unlimited free travel on public transport including metro and urban buses and discounts on Barcelona Aquarium and IMAX.
Every card Barcelona city card comes with a free guidebook with helpful information on attractions as well as a city map. The €25.00 card is valid for 2 days and the €40.00 card is valid for 5 days.
You can purchase Barcelona city Card through "activity breaks" with the phone numer +44 28 9039 5705.
Hope this helps!