You can arrive to Kızılcahamam by "Şampiyon Kızılcahamam" and "Kızılcahamam Seyahat" in 55 minutes safely, which take off once in 30 minutes from Atatürk Kültür Merkezi and from Yenimahalle Bridge.
From Istanbul with your personal car it is 35 km from Gerede and 90 km from Esenboğa Airport.