Tip: in summer, if you go early you can access for free. That means, before 8 a.m. Sun comes up at 6:30. I know thats very early and that you will probably be on your vacations, but trust me, if you want pictures without 2,374 tourist in them, going early is the best bet. Plus you can see it in less than an hour so, when the hordes of turists start to arrive, you will be almost done walking this beautiful park and with great photographs with no people in them but yourselves.
Take the metro and go out in Vallcarca station. From there 15 minutes walk. If you dont like (or can) climb hills, take a taxi, because to get there is just uphill.
They also let you go in for free after 9:00 p.m. I dont know if light is still great to take pictures and see the whole thing.
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