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Five getaways with a night away and two day trips from Lleida for Holy Week, Maundy Thursday to Easter Monday: the last Baqueira pistes, the Priorat with the charterhouse open on holiday Monday, Mont-rebei, Añisclo, Peñíscola castle and the Siurana reservoir.
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Baqueira's season usually ends in early April, so an early Holy Week still has open pistes and spring sun. Check the resort's closing date that year before booking: if Easter falls late, there is no skiing.

The Escaladei charterhouse is closed on non-holiday Mondays, and Easter Monday is a holiday in Catalonia, so it can be visited that day. Terra Dominicata is for adults only: book hotel, meals and tastings before leaving.

The La Masieta car park, the entrance to Mont-rebei from Lleida, opens on holidays from February, and in Holy Week it sells out. Book it up to 23:59 the night before, and the Astronomical Park pass earlier.

In April the Añisclo canyon starts its best season, with meltwater; the narrow HU-631 may be one-way on peak dates. In Aragon Maundy Thursday and Good Friday are holidays, not Easter Monday: that Monday Aínsa is quiet.

In Holy Week Peñíscola's old town fills in the afternoon, and the boat around the rock is the way to see it from outside. Enter the castle in the morning, and book Casa Jaime, which only takes phone bookings.

The Siurana reservoir kayak opens on spring weekends, and in April the Trona ledge is done without the summer sun. Book lunch inside the village: in Holy Week it is what runs out.

If Holy Week turns rainy, the Codorníu cellars are toured underground by train, under cover. They open all year and under-8s go free: book the visit and lunch, because on a rainy holiday they fill.
Questions
If Easter falls at the end of March or early April, Baqueira is usually still open. If it falls late, the season will have ended.
Yes, across Catalonia. In Aragon, on the other hand, Maundy Thursday is the holiday.
Geocaliahttps://www.geocalia.com/en/spain/catalonia/lleida/getaways/easter-holy-week