550 pesos local 1000 pesos foreigner

I don't know about that, sorry 😊

Yes you can wait in the briefing center or in the benches at the shore.

We rented 3000php round trip van from Moalboal to Oslob. We stop at another holding area 50 meters from the whale watching center. We paid 1100php for whale watching and snorkeling. You can pay 600php for just watching the whale from the boat. But I am not sure there is a system to distinguish both groups once you are in the boat. We brought our own snorkels though this and lifejacket are provided free. Our kids use their own life jackets as it fitted them nicely. We were at a holding area where many tourist van parked. We paid our fees, change to wet clothes and have light snack at a wooden hut. Once our number is called we were transported to the whale watching centre, then quick briefing. Lined up for wet gears then go to boat waiting area. Jump into boat then swim with the whale. Our Boatmen was strict about jacket so we did not free dive.

Early morning the sunrise 6 to 7am is the best time to watching the Whale sharia. Enjoy

You don’t need to dive as they come up to the surface. Just snorkeling would suffice and actually be much more enjoyable.