My Wife & I spend the first week of October in Salou every year and we fit in 2/3 days at Port Aventura every time weāre there.
Itās a great time to go as the park is extremely quite mid-week with most rides being walk-ons and you also get the bonus of the park being decorated for Halloween. We always buy the 2 Parks/3days ticket which means we can spend a day at each park mid-week going on all the rides when the queues are really short (donāt forget the shows, theyāre all amazing) & then we go back at the weekend when the park is really busy, just to watch the Halloween Parade which is only on Sat/Sun at the start of Oct. We also get as many night rides on Shambhala as possible. (Front row in the dark is the nuts)
We always stay down in Salou which is a beautiful town with great hotels, beaches,bars & restaurants. Itās a fantastic cost effective alternative to the on-site park hotels & itās only 15-20min walk to the park from the town (their are also plenty of buses/taxis and even a boardwalk style train) that will take you there too for a few Euros if you donāt want to walk).
Our last hotel room in Salou had an amazing view of Red Forceās Top Hat from the Balcony, was right next the beach and cost less for a full week than it would for 2 nights in a park hotel.
We fly from the UK to Reus Aiport which takes around 2.5 hours. Reus airport is only 15mins/8miles from Salou & Port Aventura and a taxi costs about 35 Euro each way in a taxi.
Hope that helps,
enjoy you trip.