Greg & Viv - The Galapagos adventure on Xpedition is indeed excelllent, as Grant noted. Pat & I did the trip in May, 2009 and loved it, although I did not get Grant's gorgeous photos. There is a monster thread about Xpedition on the CC Celebrity Roll Call boards:
Xpedition-Anyone Recently Back? Although it is very long (446 pages at the moment), nearly every possible question about the trip is answered somewhere on the thread, usually a number of times. It was the source of loads of good info for us.
Cheers, Fred