Last year I went to a wonderful festival in the North of Portugal. Small affair about 3000, 4000 people in a town by a river.
The lineup this year is looking AMAZING.
To name a few:
The Bug w/Flowdan & Manga
The Cosmic Dead
Gum Takes Tooth
All we Are
Cairo Liberation Front
+ Lots more.
It's super cheap (50 Euros I think) and drinks & food are really cheap when you get there.
Plus there are two swimming pools by a stage in the daytime!