April 2019 we fly into San Cristobal for six nights, then plan four nights on Santa Cruz followed by six nights on Isabela (before returning to Santa Cruz for one night to facilitate our flight home).
Bearing in mind that we may see lots of the same varied wildlife from/on the other 2 islands anyway, what would be the best tours to consider (boat or otherwise) for our 4 days on Santa Cruz? Is 4 days enough or should we transfer an additional day(s) from one of our other island stays?
Our interests ore obviously wildlife but also snorkelling (we have all of our own gear) we do not dive. We also like trekking but not quite so far nowadays as we are in our 60's.