I'm planning to stay in Karlovy Vary, but I'd also like to see Mariánské Lázně, Františkovy Lázně and other sights in the villages. I don't know if should rent a car or stick to public transport? Any pros and cons would be much appreciated. My hotel has parking services, that is not problem. Should I expect traffic jams in August? Are there frequent bus or train services between towns? Any other things to cencern myself with?