Im going to Ibiza at the end of May and was hoping to bring my Phantom 4 Pro along...

Anyone know of any rules & regs or where to find them?

Cheers

Jacko

The rules in Spain are basically, not fly over persons or populated areas, not fly in towns, not fly in Nature reserves and National parks, not fly over beaches with persons there, and of course in an airport influence area. It's suppose that you cannot fly at night.......
The airport in Ibiza is in the south side of the island.

And you must have your Phantom in sight and below 120 meters ( 400 feet )
You can receive a fine up to 225.000€  
Bring with you your license, and don't forget to ask in your airline about transporting batteries.