Arillas prices are around the 4e mark for a large draught. It depends if you are at a pool bar or taverna etc.
I do not usually drink beer but I have had a good draught at Rainbow and Tria. I think 4e and of course you have the option of using the pool, have a snack etc.
Not sure of Malibu or Coconut prices but with any evening entertainment the price could be a twinge more.
(Other recent visitors will know)
Now in Sidari, there is so much competition, for trade, a large beer can be found for e2.50, especially on the long strip. But in some places that "large" can be quite "small" and a mythos for example could easily overflow the glass that the draught is poured. (Mythos/Amstel in Sidari can also be e2.50.)
If I am shopping in Sidari then I have a beer in Baze bar. Now that is a large draught! - e2.50
and , with the price of petrol do you want to travel anywhere to save a few euros on a couple of beers?
Cheers
Negg