SKY LOUNGE SIRIUS
You should go to this hotel restaurant as much for the view as for the food. It's located on the 70F of the tallest building in Yokohama (the Landmark Tower), and it has large windows for you to enjoy a majestic view of the Yokohama harbour and cityscape. As for the buffet, which is not exclusively a sweets buffet, it is various kinds of cuisines, and plenty of desserts to choose from, from fresh fruits to scones to many types of cakes. Everything is top quality and well presented. For lunch, the price is about ¥4,000.
Ocean Terrace ブッフェダイニング オーシャンテラス
Ocean Terrace is also a buffet restaurant with an amazing sweets selection. The main dishes include steak and Italian and Japanese cuisine mostly. The desserts include freshly baked pastries, cakes, mousses and fresh fruits! An additional reason to go there is the peaceful view of the Yokohama harbour. Prices are ¥3,300 for breakfast, ¥3,800 for lunch, and ¥6,500 for dinner.
Somer House ソマーハウス
This Cafe Lounge is one of the best places in Yokohama to enjoy good quality pastries and various other desserts that include some seasonal menu items. The atmosphere is quite sophisticated and relaxed at this buffet which is geared mostly towards an adult clientele. You can choose from a good selection of teas as well to enjoy your sweets with. The dessert buffet is around ¥4,000.
Sea Wind シーウインド
In this lobby lounge restaurant of the Sheraton Hotel, you can have an all-you-can-eat sweets buffet which changes with the season. They have a night sweets buffet every Thursday and Friday evening, which includes plenty of cakes. The ambiance of this restaurant with the high ceilings and decor is luxurious and calming. Buffets are about ¥4,000.
Aunt Stella's (Yokohama Location) ステラおばさんのクッキー 横浜相鉄ジョイナス店
This bakery is Japanese but it specializes in American country style freshly baked cookies. If you have a soft spot for that, Aunt Stella's a must go because it has an all-you-can-eat cookie option for one hour that is less than ¥1,000! And at that low price, it even comes with one drink.