I don't have a Switch Online subscription, and have no intention of getting one, so the only way (aside from physical LAN meetups) that I can get fruit that isn't native to my island is to use Nook Miles Tickets and visit random islands.
This seems to have worked to get me coconuts and pears, but despite many Random Islands I haven't found any of the other 3 fruits.
Most guides and sources say that you can get random fruits from these islands, but a few individuals have said that you will only ever find one extra fruit this way. I've looked online for confirmation that this is how it works, but haven't found a solid answer.
Am I actually able to get all 6 fruit types just from Nook Miles Tickets?
Best Answer
No, unfortunately you'll not be able to get all 6 fruit types without using online services. Currently, the game will let you get only 4 different fruits with local play:
PS: It's not possible to know which is your sister fruit until you visit the island for the first time. But then, when you visit this same island again, it will always be the same sister fruit you found the first time.
PS²: There are rumours you can receive different fruit from villagers as a mail gift, but I personally never experienced this.