These points will appear directly near, or in front of Stella's ship. There are also some mini events that may happen in certain points of the map.
Bus Stops function as fast travel locations where Alex the seal can teleport your boat to any other Bus Stop you have discovered.
Francis runs a shop where he buys anything and sells a few oddities. He also offers Stella errands, which are simple fetch-quests. You can buy Odd Seeds from him, which can be planted in the garden to produce various Tchotchke.