My partner and I are planning on going to the Galapagos sometime between mid-Jan and mid-Feb, 2008.  We have enough time, flexibility, a sense of adventure, a lot of travel experience, and speak Spanish.  Should we consider doing it on our own, that is, travelling from island to island on public transportation?  Our travel agent said we would only be able to book large cruise ships.  Not true, right?  Would we need to book accommodation ahead?  Would we be able to book kayaks for day rentals?  Any advise would be greatly appreciated.