I'm sure you realize that you are heading into the mother of all destinations for Europeans on holiday. People don't generally go to the Balearics looking for peace and quiet. That said, I did enjoy my time in the Balearics in 2006, and you will be there before the really large crowds arrive. I was there in August
- not recommended.
Cala Blanco on the NW side of Ibiza was my favorite anchorage in Ibiza. There are only a couple of homes in the Cala and no beaches or tourist excursions. The bottom is mostly sand with a few rocky patches. Most of the other calas have tourist hotels and/or are very crowded. If there is a tourist beach in a cala it is often roped off about 100M or more from shore forcing boats to anchor
in 10-20 M of water
. Puerto San Antonio is the largest harbor on Ibiza and an interesting city, but the holding ground is very poor.
I didn't find any secluded anchorages
on Mallorca. However I did spend a pleasant week at anchor in Puerto de Andraitx. It and Puerto Colom were the least touristy harbors that provided room to anchor. Puerto Colom is the best natural harbor on Mallorca and the town is very pleasant, although most of the harbor is shallow and filled with moorings.
Cala de la Calobra is very touristy with a public beach at the head
, but this is one of few beaches that is not roped off. Also the excursion boats don't go into the anchorage, but into a separate cala. Calobra is a spectacular anchorage in a very deep, almost fjord-like gorge.
Be sure to stop in the central market in Palma and stock up before leaving on your charter
. There is an anchorage just outside of Palma at las Illetas. It again has a resort beach and can be crowded, but it is very convenient if you want to get out of Palma without having to go far. It is a good jumping off spot of Ibiza.
With a 4 week charter
you should have plenty of time visit both Ibiza and Mallorca.