In 2011, the guerilla was ravaging the region. Today, it is quite easy and safe to travel around the region.
The first bigger city after reaching Colombia from Venezuela is Riohacha. There are variouse busses from Maicao or Santa Marta everyday - price ranges from 30.000 for Riohacha - Santa Marta and 10.000 Maicao - Riohacha
Read the Stay safe section on the Colombia page.