The Kamýk Reservoir is a dam on the Vltava River located in the Příbram district. The exact meeting point, where you can also park your vehicles, is here: Waze navigation link: https://waze.com/ul/hu2f470frr
From Prague, take the D4 highway towards Příbram and exit at the 45th kilometer towards Jablonná/Solenice. Once you enter the village of Solenice, follow the river downstream until you reach the meeting point.