Not all kayaks are the same. I suggest going over to Yellow Fin or the Seagrove Ice House and learning a little about the different types and which might best suit his purposes. If he gets a short and fat one, when he wanted to do some miles, he will never get into kayaking. ;-)
Marlese, over on the Harbour in Destin (Kayak Experience) has free demo days once a month, and there, he can tryout all different types of kayaks for free, while having funn at the same time.
Thank you. Please see my shameless plug in the Business section.:clap_1: ;-)