Walkthrough: You will arrive in Akala Island on Heahea Beach. This is a small location just off of Heahea City, where you can play Mantine Surf and find Samson Oak after collecting the Totem Stickers across The Alola Region in order to receive free Pokemon. There is not much to this beach, as you will simply use it to reach Heahea City to find Lillie and Professor Kukui.
Gift Pokemon (Samson Oak - Totem Stickers):
Gumshoos, Marowak, Lurantis, Vikavolt, Mimikyu, Ribombee
Items:
Soda Pop - Northeastern Beach
Star Piece - First Place Mantine Surf
Revive (Hidden) - Middle of Beach
Pearl (Hidden - Pearl) - Near Mantine
Shop Tents:
Berry Juice - Full Heal - Max Potion - HP Up - Protein - Iron - Calcium - Zinc - Carbos - Ether - Max Revive - Rare Candy - PP Up