Nowadays you only need 2 buses.
When you get on the first bus the ticket is timestamped.
You can then get on any other bus as long as it is not on the same line for up to 1 hour afterwards.
You only have to pay once.
You can buy a ticket and a bono on any bus in Granada except the LAC .
Get the SN1 to the cathedral
Then get on a C1 or C2 to Paseo de los Tristes.