Rob
I had a quick look at holidays putting your dates in and I saw
Vietnam at Christmas depart 18th December..13 day tour
Peru depart 20th December ...11 day tour
USA Golden West depart 23rd December....12 day tour..
Could any of them work for you..
There are of course many others closer to home... I have not done any if the above tours so I can not help you on what's in offer.
Cindy