Also remember that the Tauck price includes the gratuities for the director, which is an additional savings over ABD as well. I think they'll release 2018 trips in April. They used to have recommended and minimum ages, but now they have some weird language about 8 and up being welcome. But they let us go to Costa Rica last year with my 4 year old and he and my 6 year old got to zip line despite the fact that it says you have to be 8+.
ETA: It says in a different place Recommended age: 8+. Rafting is available for children 6 and older.
So I assume a 6 year old can go.
My kids will be 9.5 and 7.5 during the time of the trip so I am hoping that would work. How many people are typically in a group with Tauck? I take it you have been pleased with them if you have toured with them previously?