Oh the temptation to turn right around was GREAT!
I did love Amsterdam, the people are so warm and friendly, the town is so easy to navigate and it was close enough to make a long weekend of it easily.
I visited Spain almost every year and most of my travels were in Catalunya.
I was also entranced with Gaudi's work and would visit annually to check on the progress of Sagrada Familia; which is AMAZING!!! Over 150 years on and still building to his plans.
And then I discovered Sitges!

I usually stayed in Sitges and made day trips on the train to Barca and Figueres and all around the Costa Dorada and Costa Brava. I love the high speed train lines in Europe. So easy to get around.
San Francisco is definitely well worth a visit (or ten).
I hope you make it over here sometime.
The hard thing about travel, IMO, is deciding where to go...the world is full of so many amazing places. When I lived in the UK I had to balance my desire to see everything and go everywhere in Europe, with my need to also come home and see my family over here. Now that I'm here, I'm balancing my desire to travel far as opposed to the places that are much nearer (but seem so... common, so known). Does that makes sense?
It's a hard life