hitching to the north side of Balaton
You should walk to the north of town, following Palotai ut or Szent Florian Körüt. At the end of the town, there is a roundabout where the only main road on the north side of Balaton starts. Use a sign, saying Veszprem. Once you're in the rural areas you can hitch with a thumb everywhere, people there are very likely to pick you up.