Which poolside shop features snacks, fountain beverages, mug refill stations, and frozen treats?

The Lava Shack is the correct answer as it is specifically designed to cater to the needs of guests looking for refreshments while enjoying the poolside atmosphere. This shop typically offers a variety of snacks and frozen treats, along with fountain beverages. It is commonly found at Disney resorts, where visitors can conveniently grab a quick bite or drink without leaving the pool area.

The other options may offer similar items but might not specifically encapsulate the array of snacks and refreshments that The Lava Shack is known for. For example, a Poolside Café might focus more on light meal offerings rather than snacks, whereas Aloha Snacks and Island Treats could emphasize specific local flavors or themed items, not as broadly as The Lava Shack. This makes The Lava Shack the ideal choice for guests wanting easy access to snacks and drinks while relaxing by the pool.