Murcia is a really nice city. Their ground, the New Condomina, is very much like the Ricoh in size and design. I've been there a couple of times, but when they were far better than now, and there used to be a good atmosphere. They used to play at a small ground in the city centre, the Condomina, which is a bit of a dump. I believe there is another team playing there now, UCAM Murcia.
Elche is a good place too, one of my favourite Spanish cities. Their team was relegated from La Liga for financial matters, saving Eibar from the drop. Now they have been relegated again to 2B. They have a fine stadium, the Manuel Martinez Valero, which holds about 36000 and was used for the 1982 World Cup. These days they rarely open the top tier.
Either of those would be a great trip, I may even be tempted to hop across for a few days myself. However, it would be typical of City to be playing some teams from the Tercera (4th tier) in a tatty little ground holding about 2000, there are plenty to choose from! And it will be the Spanish close season, their play-offs are still going on from last season.