Hi Chrissie - not such a thick question - I live here and am still trying to work it out!
They are all together at Campoamor, just off Cabo Roig strip. Turn right at BricoTodo and head up the hill.
I think that PGI is behind the shops - ie Aldis etc and this is where I am told there can be a bit of a whiff as the sewerage works is in the dip just across the road from Aldi.
PGII - where I live - is at the back of PGI towards the orange grove - I haven't smelled anything here but have only been resident for 4 weeks!
PGIII - I found this yesterday! Decided to go for a drive and found it behind the second part of the commercial centre - where the Irish pub is. Just drive down the wide road and it is on your left.
If you are thinking of buying there seem to be lots of properties on II and III which are still available. With San Jose's problems there may be delays but I'm sure the administrator will want to get as much cash in as possible. There are also resales from lots of different companies - just take a drive around and you will see all the ads.
If I'm wrong then I'm sure soemone will let me know - I don't get blonde moments as I'm mostly grey - but I do get CRAFT moments (can't remember a ... thing!)