The route from Tallinn is fairly simple. Just head out on Pärnu mnt. and follow the signs. The highway leads right to the centre of town. Coming in from Riga is just as simple - follow the signs out of town towards Tallinn. Thanks to Schengen, you won't even have to stop when going through the Latvian-Estonian border - viva international friendship! But take your travel documents with you because police can stop cars for document checks - not so viva.