We got the metro to the Park Guell stop, and then the walk was about 20 minutes, which was all up hill, they even have escalators in the middle of the road as some parts of the hill were so steep to climb up! We walked round the top of the Park and got some amazing views, and then decided to go and buy tickets to enter the main part of the park. Using the tickets from the previous day (the museum tickets) we managed to get cheaper entry which was useful!
Looking round the actual park was amazing, there was so much to see, I really enjoyed it, I think it is definitely something that should be seen and getting the metro there was easy enough. We went for a late lunch in town and I had the nicest vegetarian paella.
For the rest of the afternoon we lay by the pool enjoying the last bit of the sun, that evening we headed out for tapas and tried lots of different dishes. It was an amazing (but very short) holiday and we found that we could definitely do Barcelona in a short amount of time for not too much money! Before we went we had been warned about the crime level in the city but I found as long as you were very aware, and kept hold of your bag, then it was quite easy to stay safe. There was definitely more that we could have seen, but Barcelona on a budget worked really well!