You can see a lot of beautiful vistas from the liveaboard and may get to spend some quality time with frigates and boobies either drafting the boat or perched on a railing, but the land visits are now limited - nowhere near enough to experience the full beauty of the islands and their wildlife in my experience. You will likely visit Bartolome, and Santa Cruz for tortoises (the latter the most touristy and populated of the islands). I would consider North Seymour and possibly also South Plazas day trips if you are starting/ending in Santa Cruz. I have done both multiple times and would do both again. You can also do a Bartolome day trip (earlier start, longer day) if your liveaboard isn't hitting it.
Depending on how much time you have, many liveaboard divers spend time in Isabela pre/post trip now, which has a lot of wildlife (including penguins and tortoises) and tour opportunities, as well as a volcano hike, a very beautiful lava bridge area, etc.
All my trips I have done significant extensions, including land-based diving from Santa Cruz, San Cristobal and Isabela; day trips to other islands by boat; Isabela land tours; local exploring via foot, taxi or motorbike (motorbike may be impossible now). Working with someone local makes it a lot easier to book some of the smaller hotels, find out the best DMs and dive ops currently, etc.
Hope you'll let us know how your trip was when you get back!