Itinerary for 3 day trip to East Spain

Here's an ideal itinerary for 3 days in East Spain:

Day 1: Valencia

Start your day with a visit to the City of Arts and Sciences, a futuristic complex of museums and cultural venues.
Next, head to the Central Market, one of the largest and oldest markets in Europe, to sample some of the local delicacies.
After lunch, take a stroll through the historic center of Valencia, visiting landmarks such as the Cathedral and the Plaza de la Reina.
In the evening, head to the trendy Ruzafa neighborhood for dinner and drinks at one of the many hip bars and restaurants.

Take an early morning train to Barcelona, arriving in time for breakfast at one of the city's many cafes.
Spend the morning exploring the Gothic Quarter, with its narrow streets and historic buildings.
After lunch, visit the Picasso Museum, which houses one of the largest collections of the artist's works.
In the evening, head to the trendy El Born neighborhood for dinner and drinks at one of the many tapas bars.

Take a morning train to Salou, a popular beach town on the Costa Dorada.
Spend the day lounging on the beach, swimming in the Mediterranean, and enjoying the many water sports on offer.
In the evening, head to the PortAventura World theme park, which features roller coasters, water rides, and other attractions.
Return to Valencia in the evening, and enjoy a final dinner at one of the city's many excellent restaurants.

I hope this itinerary gives you a good idea of what to expect during your trip to East Spain. Have a great time!