Planning a trip to Farasan

Hey Guys,
I'm planning a trip to Farasan Islands off the Jazan Coast, can anybody help me with the tickets ..
Everybody's saying get them online ... Please share the link of anybody knows about the website ?

Apparently you just have to go to Jaizan tickets to the island are free. there are two shuttle boats 7:30 am, 3:30 pm

http://www.splendidarabia.com/location/jizan/farasan

I know about the shuttles, but I'm going on Eid ..
I'm afraid all the ferries will be booked because of the rush, that's why I want to book in advance.
Thank you.