Sun protection while touring
I recommend wearing a helmet and something like a cycling cap or something similar to an Under Armour skull cap
 that can absorb sweat and protect your head from the sun.

As for your neck, I've always used sunscreen during sunny rides.  Get a bottle that can fit in your saddlebag or backpack, and apply it liberally and as often as necessary.  Sunscreen will protect you from the sun without impeding your ability to move, and it will not be affected by strong winds.