If you still want to do something in Europe or UK, I used Cosmos Tours several times, and I was always very happy with them. Their sister company, Globus Tours, offers much the same, costs more because Globus uses hotels which are right IN the city, whereas with Cosmos you get back on the bus and ride OUT of the city for your hotel.

Grand Canyon sounds terrific too! I had a week in Sedona Arizona and took a day trip from there, it was fantastic! I sure do wish I could spend time AT the Grand Canyon, but then, I wish I could spend time almost ANYWHERE, I LOVE to travel!