Salinas is my favorite beach, the crowd is so various. You need ten eyes to see all the beautiful people.
It's easy to get there by car, and there's a big parking place.
I think Sa Trincha is the best place to hang out during the day (except on sundays and mondays but that's personal) but the other bar "Jockey" is also nice.
So the next time you're Ibiza you must check it out !!