Here’s the post-mortem analysis, for people curious how it went.
I had three key locks (tent, box inside tent, car), and two combination locks (backpack inside tent, box inside car). Finally, the last thing to unlock was an android tablet with a 4-digit unlock code.
The groom and I both play Magic, so I knew I wanted one of the puzzles to be a Magic puzzle. I ended up hiding Magic cards in a variety of places, including in some of the locked locations. Eight in total. Along with a play mat that indicated where they were and that the amount of damage was the solution to the puzzle. I ended up making the puzzle more complicated than I intended since I missed one interaction, but didn’t realize until the day before when it was too late to change.
Two hidden keys (to the car and the tent) were in fairly obvious places (one taped under the picnic table, the other taped to a Magic card), and were found quickly. I wanted to broaden the scope of the search quickly, and that worked well.
The other key was buried, and there were 5 numbered instructions indicating the starting point, and how far to go in various directions. There was also a measuring tape and a compass hidden in various places. Most of the distances were in Smoots, with one in feet, so they had to find the conversion factor (which was written at the bottom of the list of instructions I read to them). I had intended to make this one actually go somewhere, but when I tried to reproduce my instructions, there was too much error following the compass/measuring tape, so I just led them in a circle back to the starting point. Kind of lame, but they also tried digging in several places before figuring out that they didn’t actually go anywhere. One of the instructions was inside a little wooden puzzle that had to be disassembled. The puzzle was in a box labeled “Look! A Clue!” that was inside the car in full view. Tearing off the “Look! A Clue” label revealed a Magic card.
On the picnic table were game pieces from a variety of games (Monopoly, Settlers of Cataan, Magic, etc.). All red herrings except for the Magic card. Also, a crossword. I made some masks out of construction paper in various shapes and left them around. Some were red herrings, but four of them combined to go over the crossword and show only certain clue numbers and certain squares (that spelled out the combination in words). So, they only had to solve a subset of the crossword.
I printed up quotes about puzzles and hidden things and secrets from a variety of literary sources and placed them in various places around the campsite. One of them was from the Bible, and in the tent I had a kindle with the Bible on it that could be searched for the quote. The chapter and verse was another combination.
All in all, it went really well, and they had a lot of fun with it. They didn’t quite get there in an hour, but finished only a few minutes past. I did give a few hints along the way when they seemed to be stuck.