You can not bring the car to Kastellet so you have to park in Vaxholm.
During the summer, many people visit Vaxholm and it can be difficult to find parking, below are some of the nearest long-term car parks and Vaxholm City’s fees for parking.
NOTE, For parking on Rindövägen 3, you need to take the Road Ferry to Rindö. The road ferry runs around the clock, is free and it takes about 5-10 minutes to cross.