When-ever we arrive at a new town one of the problems we face, is finding a car-park.
We managed to find street parking near the Post Office. What we had to do, was buy a ticket from the Ticket machine for the amount of time we wanted. It is handy to have some change as some machines give change and others don't! Some take notes and some don't! Once we had the ticket, it was back to the car to put the ticket on the dashboard for the parking inspector to see.
I did notice on my Town Map that there are a few Parking Stations in town.
It is quite convenient to go to Marianske Lazne from Prague.
By Train it takes about 2,5-3,5 hours,
there are many train connections during the day, most of them are direct connections .
the price is 224 CZK one way (280 CZK by faster EC Train)
The Trains leave from Prague main railway station (Praha Hlavni Nadrazi), station easy accessible by Metro (subway)
for train schedule you can check the Railway page (is also in english & german language):
In Marianske Lazne You can use electrobusses from Train station to the city (about 10 minutes drive, 8 CZK )
Have a nice Trip :-)