This episode falls during the Jaya Arc , right before the crew heads to Skypiea. It's the transition where Luffy, Zoro, and Robin are exploring the forest looking for the South Bird, while Sanji, Nami, Chopper, and Usopp are watching the Merry.
Are you currently rewatching, or is this your first time through the series? One Piece Episode 148
That's a great episode to highlight! is titled "The Legendary Family! 'Daddy the Father' of the Afternoon." This episode falls during the Jaya Arc ,
Here’s a quick piece (no pun intended) looking at that episode: One Piece Episode 148