A day after the beach in Sitges you should go play a round mini golf in the Vinyet, Sitges. At 19:00h after the soon is not that strong play in the 18 holds. Have a beer or a Gin tonic for 5euros. For the little ones they have 2 trampolines. There is also a Ping-Pong and a Foosball table.
Address: Passeig de Vilanova, 142