Avoid the cheap sunglasses. The quality of the lenses on the cheap ones will just make everything harder to see. I've also heard that you shouldn't use lenses that are too dark because your pupil opens up too much for the amount of UV out there...and cheap sunglasses aren't all that great at blocking UV. Definitely drink water if its hot, and an eye exam wouldn't hurt either if you haven't had one lately. Much less painful than seeing a dentist.... When i got my glasses I got a second pair and had them tinted dark brown...much easier on the eyes when outside now.