In reply to Heike:
Mallorca's pretty small, so drivings not much of an issue, it takes maybe an hour to get from Palma to anywhere. Maybe more of an issue if you're in the mountains, or port soller (mountain pass/toll tunnel access).
We went in April '12 and it was warm enough to be shade-chasing for climbing in the morning. Beaches in the afternoon, sea was pretty cold, but apparently by May it's warm enough to swim.
We were in a villa near port pollenca, which was great for us, the toutist hotspots are magaluf and the south-east coast (very built up).