The Pyrenees are certainly a beautiful destination for a week’s holiday. I too am planning to go there (maybe in August), walk up, and maybe climb, to the Observatory.
Alternatively, I would recommend the Campo Imperatore Observatory on the Gran Sasso d’Italia at 2130 m above sea level. I live in L’Aquila, a town at the foot of the Gran Sasso, and I go up to the observatory and beyond from the base station of the cable car very often.
Come on, come to Abruzzo, I’ll guide you up to the Calderone glacier and to the western (2912) or eastern (2903 m) summit. These are the highest peaks on the Italian peninsula. Check out youtube and you will be convinced that it is worth it.
In any case, I wish you an excellent holiday.