lookout platform; observation deck; viewpoint
A raised platform or structure built for enjoying a scenic view. Often found in parks, mountains, or tourist spots. Similar to 展望台, but 見晴台 can sound slightly more casual or rustic.
See also: 展望台
There is a lookout platform at the top of the mountain, and you can see the whole town.
From the observation deck in the park, we had a clear view of Mt. Fuji.