We did the speedboat trip with Spyros this morning, and it certainly lived up to all the enthusiastic reports we have heard, and previous comments on this site.  Spyros is a wonderful, entertaining host, and he gives you a great morning's outing.  Certainly a must-do on your next holiday.
 
Sarah,
 We are neighbours of George and Kiki of Aspassia
Studios.  They have four young children themselves, so you will
find it very child-friendly.  I've just checked with Kikitsa and
they will provide you with a cot.  By the way, you will be very
close to the beach, which is shallow, and wonderful for kids. 
Enjoy your holiday.