If anyone's interested, here are some rates. I was only able to get incomplete information since I called when both shops were busy. Nonetheless, here it is:
Big Daddy's 1-877-865-2997
Single Kayak, weekly rate $185
Double Kayak, weekly rate $205
Includes pick-up and delivery locally, paddle(s), lock, and lifejacket. Can reserve.
Yellowfin 1-850-231-1717
Double Kayak
1/2 day rate $55
1 day $70
2 days 100
3 days $120
4 days $140
5 days $155
6-7 days $165
Forgot to ask if that includes pick-up, etc. Yellowfin doesn't take reservations and by the sound of it, they're doing a pretty hot business. There's nothing available for this current week at all.

) and Merman and I have to learn how to paddle together. I think I might be bringing extra supplies of alcohol and aspirin to the beach. Just in case. 