Yay for the poster who updated that the vaseline worked.

(and brought the month-old post up so I could add my 2 cents for the OP)
If you don't want vaseline, there's Body Glide (available at running shops, REI,
walmart) and Gold Bond makes a chafing stick as well. Some just use deoderant. Bottoms of the feet, tops of the feet, between the toes, on the front of the toes if you move around in your shoes a lot....
For reference I have tried Keens and they absolutely destroyed my feet. Definitely took a bit of the magic out of our trip.
I have wide, flat feet
"
Do you offer wide or narrow width shoes?
We do offer wide shoes in our Men's Utility collection. Currently, we don’t offer narrow or wide widths for women."
Don't use Keens with wide feet, unless you already know they work for you.
I tried wearing
Crocs flip flops in the parks and had blisters within a half hour.
My fitted, good, running shoes were killing me on a DL trip. I talked to a lady in line at rope drop one morning, and she said she had the same problem and to get Crocs Athens. Warned me of the first day blisters. She swathed her feet in adhesive bandages and recommended I do the same if I got them. I got them and didn't. Blister city! But my foot BONES felt so much better. So the next day I put bandages all over the tops of my feet and in between the toes where the thong goes, and it was HEAVEN. Now I never have a problem even when I got newer Athens, because my feet were used to the material I suppose.
OP you have to find your own foot-heaven. Others recommend plush running shoes; those kill my ankles. I have to work my feet and ankles or they end up a mess. So I've gone to lower and lower amounts of support and cushion; I love my New Balance Minimus shoes, with almost no support (they are basically Vibram 5fingers, but with a toe box not the glove style). Their only problem is there are vents in the bottom of the shoe, so if I walk/run in a puddle, my feet are wet. Nike Frees are my other go-to shoe because they have minimal support but don't get my feet wet. Switching between those and Athens and I'm good. But by NO means does that combo work for everyone!
If you do go the running shoe route, don't JUST go with a place that has the treadmill, but make sure they have a great return policy as well.
Also, ever notice that the treadmill places never have you run with the shoe that they've recommended ON? Yeah, big gap there. It's how I kept getting sold on more and more supportive shoe while my gait got worse and my feet got weaker and weaker. No one ever watched and notice *that I do the EXACT same thing with my feet* in the supportive shoes as I do with bare feet, LOL. Key was to strengthen my feet, not support them in hopes that I wouldn't be able to do the same things. (minimal shoes with careful ramping up of miles, pilates, and yoga all with foot-strength as a goal = I can now make an arch when I have NEVER had an arch before! and my feet feel so much better all the time)