I think this perfectly encapsulates the way field trips are implemented, they're supposed to be a break from the main game, you aren't running for your life anymore, instead, you're in a paradise with Baldi and your friends enjoying the great outdoors, the energetic and cartoony nature of this song gets it all right.
Campfire Baldi in the BG at the bus: Great job! I can't believe it, you're incredible! Oohhhh.... You're doing fantastic! Woah! I think you- Oohhhh.... I can't believe i- Oohhhh....
I think when the 2nd revamp of the Farm Field Trip gets added in like 0.8 of Plus, the minigames in the Farm Field Trip (if the new Farm will have minigames like Camping does) will have the same song as the minigames in the Camping one.