Hi Everyone,
You have all been very helpful. I think I have a trip pulled together. It's not a perfect one because January 3rd has become an almost impossible date to get hotel reservations. Chaa Creek, Camino Real Tikal and Jaguar Paw are all booked for that date, so it sort of limited me.
Luckily, Blancaneaux had availability so that's where my husband and I are staying this trip.
The plan now is to rent a car at the Belize City Airport. We arrive at 1:00 p.m., so that gives us plenty of time to drive to Blancaneaux instead of taking a plane. We stay at Blancaneaux for a couple of days and explore. Then we drive across the country, stop at the zoo and then drop off the car and take a flight to Ambergis.
We are staying in Ambergis for 5 nights and hopefully, one of those days, we will wake up early enough to take a day trip to Tikal.
I figure that we can always go back to see more, with some advanced planning next time.
BTW, the Camino Tikal Real is no longer owned by Westin, but the Westin in Guatamala still makes the reservations for them. I think they sold to a local outfit.
It's really difficult to pull a trip like this together in a few days, but I think this can work. I called Budget Rental Car which was recommended and they were sold out of cars. Hertz couldn't give me an answer (they said they needed 3 days), so I ended up using AVIS for a rental car. I hope that they are OK in Belize. They are not always consistent overseas.
Thanks again everyone - while this is not a perfect plan, I still think that we will have fun. The Jungle Lodges may be a bit to rugged for us - My husband and I are at an age where we feel our aches and pains.

It's too bad that we didn't think of this trip 10-15 years ago, we might have done it differently.