Tacna was just a transit city for me. It's only half an hour flight from Arequipa and we were on time. So I changed my initial plan and didn't stay for the night in Tacna. Instead to the hotel I headed straight to the bus terminal where I bought a ticket for 12 soles and two hours later I was in Arica, border crossing included. - By the way taxidrivers offer the same trip for 150 soles, directly from the airport.