If you have Android, then you can, firstly, if you have a rooted phone, you can block websites by editing the hosts file on your device to redirect the sites you want to block, and secondly, download ES File Explorer. I don't know any other options.
It's not in my town, but I read that deep in the province of Cantabria is the Altamira Cave, one of the best preserved sites with prehistoric cave paintings. It's not to be missed!