From our hotel, we took the metro to Lesseps and tried to follow Rick Steves' directions from his book, but we were off. WAAAY off. We followed street signs posted every few meters. They directed us to go straight uphill! Turns out we missed a crucial turn and took a long way uphill because our return route was much shorter. There isn't a metro stop directly to Parc Güell, so follow the directions carefully!
We found Parc Güell beautiful, but HOT. And since we walked straight uphill (see the pictures!), we needed a cold drink. The cafe on top of the Parc was horribly overpriced - 2,25€ for a can of coke! If you need a drink, walk down to the cafe below or outside the Hansel and Gretl homes - the gift shop has a snack bar inside, plus trinkets and such that are cheaper.
We really enjoyed the colorful benches and tile work done by Antonin Gaudi in Parc Güell. Plus, we had beautiful vistas of the city. Look around (and over the benches) to see the small details he included, such as the waterspouts.
One of the top favorites for kids is probably the lizard at the front entrance to the park. It was so overrun by kids that we were unable to get close pictures. This is also a popular souvenir theme that pops up in all of the gift shops.
Overall, I loved Parc Güell for the colors and the design. Some of my favorite photographs are from the park - the tile work is so beautiful and vibrant on film. Also, the gift shops have great postcards, so I stocked up on ones to write and frame (cheaper than real art! prettier too!). The whole family should enjoy Parc Güell and give 1 to 2 hours to enjoy it.