Ibiza:
Marina's very expensive - San Antoni is the cheapest - my suggestion is to anchor in :
Cala Badella/Vadella - very nice place ( can hire a car and go around the island if needed)
Cala Llonga is also good in the south
The San Antoni bay is good also - but usually VERY crowded
VERY important to visit Formentera - amazing place - especially - S'Espalmador beach - ther is bouy's there you will need to pay about 35Eur - but if arrive after 5-7 pm most likley free
Ibzia town - 3 marinas - the one close to the old town is the cheapest
Alicante area:
Marina Deportiva Alicante is a MUST no matter how much it cost - as it is the centre of the city, close to everything , great place to be - just expensive for short stay, but the position is worth every penny!
Marina Santa Pola - new marina with good amenities - not cheap and always has space, nothing to see around
Marina De Las Dunas - very quite and safe place as in the entrance of a river - very good price , and increasable beach - always been vary happy there
Benidorm - can anchor in the south side of the bay
Altea - generally mafia town - all rich Mafioso has houses there
, but one of the safest place in the world also
at the entrance of the south side of Altea bay there is number of free bouy's
Moraira - there is a good bay for anchoring, but if bumpy be very careful for depth as the waves can eat get 1+ meter from the depth
Calpe nice place to be , yacht club is average pricey but very nice
, you can also anchor in the entrance for free.
the sailing to Ibiza from Alicante is done usually in two days :
1. Day - Alicante -> Calpe ( club nautico or anchor on the south or north side of the rock depending on from where the sea waves are comming)
2. Day - Calpe - Ibiza ( Cala Badella or St Antoni )
generic thing :
Alicante area is never dangerous from wind point of view - max that I have seen is about 27kts - but AWFUL swell from the sea almost 99% of the time - really annoying and no islands or really deep bays to hide - e.g. no fun in cruising to be honest - that was my main reason to move from Alicante to St Cyprien/France