Buses depend on the time of day your arrive for taxis use the following link

http://www.explorecrete.com/various/crete-taxis.htm

http://www.bus-service-crete-ktel.com/timetables9.html - every 30 minutes from the central bus station in Heraklion. You can also reash other nicer areas of Crete quite easily by bus...we've just come back from 11 days spent in Loutro, Chania, and Hora Sfakion. Not too much nightlife there though !