The tradition in the village of San Juan in Ibiza is that nine 'bonfires' are lit in a line and people jump over the fires to symbolise leaving the old year behind. Like everywhere else on the island this local fiesta starts well in advance of the day itself.
The main day though is the 23 of June with bonfires and the great Flower Power Party of San Juan. Here's the programme.
See the full programme here.