Speaking of miles, it will also cost 2,000 Miles per Nook Miles Ticket to travel to a Mystery Island, and unfortunately you can’t guarantee the island you visit is spider material, so be warned – you’re probably going to need to spend a few days amassing Nook Miles to make this work.
Be sure to use Nook Miles to purchase both Inventory Expansions from the terminal if you have the miles to spare.
First thing’s first – you’re going to need to make sure you have the right tools for the job, and as much spare inventory as you can afford.