A couple years back two longtime friends and I tried to plan an overseas trip together. We'd met in Spain as students in a prior decade, and while life's chance circumstances eventually led to us all to living in New York City, the proximity also made us lazy in how adventurous we were. Across the East River was often the extent of our travels. Maybe the rare trip Upstate. To address the situation, we planned a trip to Scotland. Then that fell through. A year later, we stoked the embers again.
One of us had PTO to burn, another planned to leave a job. The timing seemed right. But to me, the original plan didn't. The logistics were wonky, the weather untrustworthy, and I craved something more heedless than traipsing around Highlands villages (i.e., going to pubs). It seemed portentous that it was now 10 years since we'd all met in Spain too, so I ran a search for "hut trips near Barcelona" and found a route in the Catalan Pyrenees that looked manageable.
I knew the Austrian and Italian Alps were famous for hut-to-hut hiking. But Spain? I also knew that convincing these two friends to sign on for this new plan was a long shot, but that this was the type of adventure we needed. I'd have to sandbag them.

Some character background: Both of these friends live in big cities—New York, London—and while they've both done some hiking and camping, neither of them are people you would describe as "outdoorsy." (One of them will take offense to that and one of them won't, and I don't have to identify who will and who won't because, on the off chance either of them read this, they'll both know.)
I put together a plan for the entire trip; a backpacking checklist, hotels, huts, driving times between locations, alternate options for everything. I also made a detailed outline of the three hiking days with distance, elevation, and estimated time on trail clearly, boldly noted. I knew that these numbers wouldn't mean much to either of them but they'd create trust in the plan—the necessary foundation of a good sandbagging.

Tickets were purchased, hut and hotel reservations were made, wool socks were purchased. We met at the Barcelona airport on an afternoon in early October, got in a rental car, and headed north. First, a night on the coast: cervezas by the sea, a sunset swim to wash off the economy class gunk, papas bravas, mariscos al ajillo, tortilla, croquetas, y más cervezas. Siempre más cervezas.
The following day we didn't leave the (Salvador Dalí-themed) hotel to start the hike until mid-morning, after a backpack packing demonstration and a grocery store supply trip. This wasn't in the detailed itinerary, which, it turns out, neither of my friends read in much detail anyway. Neither was the dull-edged hangover we each harbored; an Estrella-induced headache isn't ideal for tackling ten miles and 4,600 feet of elevation. There is some camaraderie in a collective hangover though, and camaraderie is conducive for a long first day on the trail.