lens for santorini hol.

I am going to Santorini for a photographic holiday in june and because of the flight carry on weight restrictions i am thinking of getting a tamron 18mm-270mm lens which is quite light to mount on my D300 body.This combo should be a useful as a walk about lens and combined with my Tokina 12-24mm lens for sunsets etc. hopefully should cover my needs.As i would be printing A4 max sizes ,do the wise forum members consider this gear to be suitable, thanks