I really like my trip to San Sébastien.. it's a small town located on Western coast.. or else you can club Barcelona and Ibiza together ( Spain is full of scams, make sure you have a good read about it before your visit)
Spain is one of the most beautiful and exciting countries in Europe. From its stunning beach towns to vibrant cities, Spain has the best places to visit in Spain for young adults and offers something for everyone. The best places to visit in Spain for first timers looking for a unique destination full of adventure. You can watch its charming cobblestoned streets, delicious cuisine, incredible nightlife, and centuries-old architecture. There is no shortage of things to do or see in this fantastic country. 4 best places to visit in Spain for young adult : Barcelona
Madrid Ibiza
Valencia
https://denatrip.com/best-places-to-visit-in-spain-for-young-adults/
There are endless places to visit in Spain. Barcelona, Santiago, Segovia, Madrid, Seville, and Granada. All these places have their own specialties, like Barcelona's Sagrada, Madrid's Prado Museum, etc. Also, there are a lot of islands to visit in Spain, like Canary Islands, Ibiza, and Majorco. You can visit their official tourism website at https://www.spain.info and this guidebook, https://gowithguide.com/blog/tourism-in-spain-statistics-2024-your-in-depth-travel-guide-5686 to know more in depth about those places.