Usually two wide for main paths that are traveled on and one wide for little senic areas like my trail through the bamboo Grove on my last island before I reset
I usually do two wide for the walking paths. However, I have several larger areas of displays that are filled in that are about 10x10 spaces placed throughout my town. Then the 2-wide paths connect them. I find it makes more space for planting trees.
I use 2 wide for "most" paths throughout most of my island. I did 3 wide for the main path up through my residential area as it felt right (and also it fit better as an access to the beach).
i’ve always done 2 wide (even in new leaf), and i’m currently using a transparent floral custom path! i only use custom designs for my paths, as i’m not really a huge fan of the game’s default ones.
The only paths I have, which are very few, are 1 wide. And that is in my bamboo grove, in the orchard to help keep the trees spaced, and at the shops. I have a bit of a big path spot, 4 wide, where you come out of the air port, as a 'gate' to the island. I use paths for the garden, and as worn spots at the bridges, at every villager door, outside of the shops and museum, and I have a side walk for my own home that has a front and side yard. I also put a path as a worn spot in front of my mailbox. I use paths for my town square extension, at the wishing well, and two hot springs at the waterfalls, and the one in process cafe that is by the towns.
I always do 2 wide so that it line ups nicely with the bridges and such. Sometimes I wish I could do 3 or 4 wide but I never really found a good solution so that the line up with everything else still looks fine. Besides I have to keep an eye on the space, if the path is too big then I'm missing space for the villager houses etc. which kinda sucks. So I guess I will stuck with 2 wide for now.
I mostly do two, but I have seen a few orchard designs recently where paths are three spaces wide and I really like the look of it. I am working on an orchard and I might try this.
I have 3 wide started at the entrance of my 2nd island and 4 for the main path from the airport to the plaza. I'm still laying the path, so I'll probably stay in the 2-3 range, with 1 being for "beaten paths".