The Fishing Fun extension automates fishing. Though it's fairly crunchy, it's designed to be simple for the players - all they need to do is equip a rod, and use the Fishing skill button to cast or reel.

Some of the mechanics were inspired by Nefarious Nautilus

• It supports lots of gear (rods, bait, lures, lines, nets), and you can add your own if you want.
• Equipping a rod adds a Fishing skill; all other gear is optional.
• Gear can affect your chance to hook, reel, and catch a fish.
• A character's species, proficiencies (Nature/Survival), and background can help too (and are automatically applied).
• DM may allow Str or Dex bonuses (by setting the skill attribute).
• It supports different tables of random fish (by biome), and you can modify them or add your own tables.
• Tables can have non-fish junk, or unique legendary fish
• Fish can have many different traits which affect your chance to catch them.
• There's a button so the DM can open a configuration panel (to select the biome, etc).
• There's an option to toggle it on or off, so you don't have to unload it if you're not using it.
• A table of fishy loot is provided if you want to provide some rewards.

There's no built-in support for hosting a tournament (yet), but you can do so fairly easily. Just have the players take turns (like in combat), and reward the first catch, most catches, biggest catch, and/or rarest catch.