To go to Taganga is very easy: you have two options to take a direct taxi that costs 40,000 COP, or you can take public transport. In this case, there are two buses, one from the airport station to the centre of Santa Marta, exactly on 5th Avenue and just there, take the next one that says 'Taganga'. Then he tells the bus lord to leave it at the Techos Azules Hostel station and that's it!