In Arica it's not a hassle without a car, I wouldn't want one at this point anyway. Maybe later. Plenty of taxi's here, almost too many taxi's and collectivos in this town. 1200 peso's will get you pretty much anywhere in Arica in a taxi, sometimes it may be a little more if it's sort of out of the way. Collectivos are less. Plenty of buses too. The buses lowered thier fare recently down to 200 pesos. I don't mind taking the bus in Arica but certain times of day they can get very crowded.
I don't remember how much the buses were in Valpo/Vina, 350 pesos? In Vina the bus rides are a bit longer time wise since it's a larger area but you can get most anywhere around town or suburb areas in 20 or 25 minutes.



