2nd that emotion for carrying a stash of LOA's for the brands you regularly shop. Never know when something might pop up near you that is worth doing.
As for travel perks, I'm loyal to my loyalty programs.
When it comes to hotels, I'm exclusively Best Western unless they don't have something appropriate where I will be, then I use Hotwire to get a discounted room and use PayPal's BNPL billed to my BW-branded credit card to get some points.
I had used said card for a low-interest balance transfer, meaning I could not use it for purchases until the balance was retired.
Unlike most programs, BW maintains your status even if you go inactive for a couple of years as I did.
I was able to pick up where I left off when the transfer was paid off, and reached their highest level rather quickly. I find their properties to be of consistent quality, even in more remote markets, and I can almost always find a place in my budget.
We love free hotel nights, and are especially looking forward to 2 nights in New Orleans next March, about 2 blocks off the French Quarter.
Have synthesizers, will travel...