With its narrow, winding, cobblestone streets Old Town has become one of the most popular attractions in Stockholm. It's home to many restaurants, souvenir shops, and museums as well as the Royal Palace. You can easily get there by taking the subway from Stockholm's Central Station and get off at Gamla Stan.
Gröna Lund is Stockholm's theme park. There are rides available for all ages and in the summer months they also have concerts on the Grand Stage every now and then. You can get a Ride Package which includes admission and unlimited rides for $45 per person.
Skansen is an open-air museum and zoo housing animals of all sorts, as well as old-time residential houses. It opened in 1924 and it was one of Emma's favourite places to visit as a child. Admission is $22 for adults and $7 for children up to 15 years old.
The ABBA museum is an interactive exhibition about the pop band ABBA known for songs such as Dancing Queen, Mamma Mia and The Winner Takes it All. Admission is $25 for adults and $10 for children up to 15 years old.