Like OC Diver, I would not be without my Kindle.
Another thing I would suggest is to bring along at least one per person pair of LIGHTWEIGHT binoculars. The field glasses are easier on the wrists when holding. You'll each want a pair.
I found Bushnell's at a thrift store with a rocker gizmo to adjust the distance. I'm not sure what it's called, but love mine.
Along with the field binoculars, a bird book (I prefer Golden Guides) would be a good thing to have aboard.
For me, in Algae (my dinghy) I have a parasol to keep the sun off me. A way to be shaded while exploring is nice. A bimini for the dinghy would be most excellent. In that regard, a cooler for the dink will get a workout.
Hint on coolers: Find some blue or pink insulating board and cut a piece that fits inside the cooler. Next, put your ice in the bottom of the cooler. Add the insulating board. Atop that, put your food. Beverages can go in the bottom.
The theory is this: Ice stays frozen at 32 degrees. Because the air surrounding the ice will be warmer, the less air you have, the longer the ice remains frozen. In testing my theory I found that with the blue board ice lasted 50% longer. Normally 24 hours, and it went up to 36 hours.
That's getting in and out of the cooler repeatedly for ice to make my tea. That was in the old days before I had enough solar to run my refrigerator. I love having the reefer. It's WONDERFUL to have cold beverages, a place to store food, etc.
This whole decadence thing is progressing very nicely!
The most important thing however is one to always keep in mind:
NO SCHEDULES.
Have fun!