Will had no real intention of fishing with everyone around, but he also did not want to break it to Bucky that he wanted to fish alone with Yelena- as much as possible.
Will can handle Bucky and Yelena, but is very uncertain about Thor- as he's not really interested in louder personalities. He was even iffy with Steve, preferring Zemo, but that was nothing against Steve- he legitimately was a very good guy. Good guys just didn't work well with Will. So Will had stayed at the max length to allow Bucky and Steve their space.
He let his pack of dogs to run around the forest near the dock, but they didn't need supervision.