Getting Lost in Barcelona

Our intention today was to go and see the Picasso Museum. Unfortunately a couple of days ago we lost the index booklet that went with our map, and so it proved to be a bit of an issue trying to find the street. Finally I saw on the map that Montcada was served by a Metro station and a bus. But when we got to the Metro station itself there was no sign of Montcada. So we deduced that the bus 96 must take us to it. Twenty minutes later we arrived at a outskirts suburb called Montcada. Celia didn´t want to get off there as it looked as though we might be in the middle of nowhere. And there was no sign of any museum - she said it was unlikely that it would be way out there anyway.
So in the end we gave up on Picasso.
We came back into La Rambla via the Metro planning on walking quietly along the seafront. However, I needed a loo (what´s new?) and there was a boat sitting there waiting to go for a tour round the harbour and beach.....
So on we got, into the loo I went, and we spent an hour and a half on the sea. It was very pleasant actually, although the water was quite rough outside the harbour basin (one woman was sick on the way back). Anyway, we saw Barcelona from the water....
When we got back to shore, we decided to have a cuppa from our faithful flask (the one we bought in Hamburg after our English one broke only a couple of weeks after we bought it. And because we weren´t sure where the train station is in Barcelona, we decided to have a recce and find it, so as to save ourselves hassle tomorrow, when we leave for Valencia.
It was just as well we did. The station at Arc de Triomphe (sorry, can´t remember how the Spaniards spell it) someone had told us served the trains doesn´t. There´s only a very large bus station there. We got back on the Metro and headed for the station called Espana, where the real train station is.
After getting on a suburban train instead of the Metro, and going three or so long stops before we realised something was drastically wrong (none of the stations were named on our Metro map), we got off and went back to where we started - almost. We were able to save one train stop by getting out a stop early. Eventually we found the Metro to Espana only to arrive there and be told that the train is kaput (as one non-English-speaking official told us). It turns out that the line is ´broken´ as another official charmingly put it, and we could either get a bus from Espana to Sants Estacio or get the Metro to it.
I´d read something to this effect in the Metro newspaper, one of the freebie papers that turn up on the underground, but hadn´t quite been able to figure out from the Spanish when the train was going to be kaput. I´m still not sure how long, but hopefully, when we go to Sants Estacio tomorrow, we´ll be able to get the mainline train to Valencia without difficulty. If not, we´re in trouble!