Just back from Malaga and here's some boring but practical advice..
1. Make sure to get after-sun cream that has aloe vera in it (
like this one). Both I and my MiL got sunburn and her Aldi aftersun cream did sweet
duck all, whereas the aloe vera version sped up recovery. Another lifesaver was thermal water spray (
I bought this one in boots). I know it seems ridiculous to buy 'water spray', but trust me.. it was a game changer on sunburn/swollen feet as it has anti inflammatory properties. I kept in the fridge too so it was extra cold.
2. I got a very sore throat towards the end of my trip and I was DYING for a lepsip/strepsils and they had none where I was staying

I got some Spanish equivalents but they were
rit. Just pack a box of strepsils/lemsip just in case the worst happens.
3. Just pack one adaptor plug, and bring an extension lead. The extension lead I bought had USB-C ports too so it saved loads plug space too.