No special access issues
To reach the Puig de Sant Martí the easiest way is through the MA-13 road of Palma in the direction towards Alcudia and almost reaching Alcudia, you have to turn to the right just past the kilometre milestone 48 when turning you will see a sign "Puig de Sant Marti". You have to follow that dirt road, for just over 1 km, when a path to the left leaves that ascends to the top of the Puig de Sant Marti. Before you get to the top there is a little parking for a few cars. The walls are 1 minute from the car. It's not the mountain with the antennae, it's the opposite little mountain.