Parapat is a small town on the edge of Lake Toba.
From Medan there is a local bus (no air-con) about every hour for 22,000 rupiah (Oct 08) if you pay on the bus. The journey takes 4-6 hours, depending on the traffic condition.
From Medan TOBATRANSPORTER +6285261492668 or email add email@example.com ; its a private van (Nice and comfort Car) 5 seaters or 7 seaters from the airport of medan (Polonia) its take 500,000 IDR and for share taxi its take 100,000 IDR per person (5 seaters); alternatively many taxi trans around medan like Paradep Taxi, Raja Taxi and etc
Public bus SEJAHTERA its every hour depart from parapat or tigaraja jetty, 25,000 IDR non air conditioned and many taxi trans like Paradep Taxi, Raja Taxi for 65,000 IDR or the alternatively taksi trans like TOBATRANSPORTER +6285261492668 or firstname.lastname@example.org ; more relax and comfortable taxi; full air conditioned (5 seaters) and the cost from Parapat to Medan is 100,000 IDR per person and from Parapat to Berastagi and directly to Medan is 150,000 IDR, included stop point at water fall; fruit & vegetables market in Berastagi