RE: Sardinia in May?
Sardinia is always a good choice. Do you have wind schedule for it? I say you only that during last August there were 26 over 31 day of wind >15 knots. In these days, Mistral or West wind are very strong (almost too strong) but Sardinia works, even when forecast show ligth winds.
Choose the north shore because the south one is good only for E/ESE/S winds and the W is rare to find after good swell from south, in Porto Pollo Sporting Club, you will find Starboard, in the others two centers, JP and RRD. The wetsuit, short sleeve and long legs 3.2/4.3.
Have a good holiday i will be there 2weeks.