ELNikkor wrote:
Yes, that lens will cover everything, but the long end will get minimal use, yet it will always have to be carried. I personally prefer something like an 18-55 or 18-135 for daily walk-around. If there is a reason for telephoto, use a 70-300. If you don't have the Tamron 18-400 yet, seriously consider getting the excellent Canon 18-135 for your trip.
The 18-135 paired with your 70D is an excellent travel set-up. For interiors and dramatic landscapes consider the ef-s 10-18. It's slow but the image stabilization allows you to handhold at very long shutter speeds. Lightweight too. You hardly know it's there.
Enjoy your trip.