The Beach House is a location in Super Mario Odyssey. It is a small round building in the southwest corner of the Seaside Kingdom. The door to the Beach House is locked, and the Bubblainian guarding it will only unlock it if Mario is wearing the Resort Hat and Resort Outfit or the Sunshine Shades and Sunshine Outfit. Inside, there is a raised circular platform in the center of the room and some Bubblainians who prompt Mario to dance. Standing on it will automatically cause Mario to start dancing. After dancing for a brief period, one of the Bubblainians will give Mario a Power Moon.
Outside, there is a staircase leading to the roof of the Beach House. Here, Mario can find four flowerpots where seeds can be planted, netting one Power Moon each. Spraying the plants with a Gushen's water makes them grow faster. There will also be a Steam Gardener here after completing the main story.
The area around the Beach House is surrounded by lounge chairs and parasols, the latter of which can be bounced off of. One of the parasols has a Power Moon floating above it. There is a Checkpoint Flag a short distance in front of the door to the Beach House, with the Beach Volleyball court also nearby.