Hi. The mossies in Benidorm seem to have details of when I am going to be there, so I should take precautions just in case, as I will be there this month too!
Seriously though, I was there last March, and the mossies did come for something to eat, especially at supper time! As has already been recommended (you most likely do already) have some plug-ins in your room. Use mossie repellant spray, (it goes very well with your favourite perfume lol). An anti-hystemine tablet containing "Loratadine" every morning is good (if you don't get side-effects) - there are other ones if you do, but these are the best. You can buy stronger ones over the counter in Beni, which might be a good idea. Also, "Diprogenta" anti-biotic cream if you get one of those nasty weeping reactions to one of them can also be bought over the counter in a Spanish Pharmacy.
Enjoy yourself!