Tsaritsino is a great park and the museum. Locals love it, because in summer you can just take some stuff for a picnic, bring your friends, maybe some sports equipment and enjoy a day. There's a really big lawn in front of the royal palace, where you can enjoy the sun. Moreover, there's a nice musical fountain, with benches around it.
The park is really big. There's a lawn where people like to hang out, but also there's a forest with some statues in it, green areas and even a few lakes with ducks. You can come to the lakes to have a peaceful moment. No one will bother you. Just you and the nature.
Museum's ticket is cheaper for ISIC students.
Su: 11:00-19:00
Tu-Fr: 11:00-18:00
Sa: 11:00-20:00