When I start up a new campaign, I always try to get together for a couple of non-gaming sessions with the players to talk about the kind of game we all want to play. I usually have something in mind, and let them know about the kind of game I'm thinking of running. I'll let them know whether...
Here's one homebrew version of a 3.5 penguin. Looking at the stats, I don't see anyting glaring that would preclude from using it in Pathfinder.
DM Tools: Homebrew: Small Breed Penguin
Are you looking for an abstract description of a puzzle that the PCs will solve by making skill checks, or are you looking for an actual puzzle that the players need to solve?
If I didn't want people to snag my houserules, I wouldn't be posting them on public messageboards!
I'm pretty shameless about snagging other GMs' good ideas. If you like mine, then please snag away!
[BTW, the messageboards at paizo.com are full of great stuff for Pathfinder.]
If you're playing by rules-as-written, don't forget the size of the marketplace. Small settlements have fewer resources at their disposal to purchase high-value items from adventurers. See the "Settlements" rules at:
Settlements
You can't receive more than the "Purchase limit" for any given...
By RAW, you can't make a potion of a spell with target "personal."
My houserule is that a caster can make a potion of a spell with target "personal," but the price is four times normal (i.e. 200 gp * caster level * spell level).
You'd need to write a short backstory as to why the PCs were there, and write a different epilogue, but the "Misgivings" section of Pathfinder #2, "The Skinsaw Murders" is a great take on the "let's explore a haunted house" adventure.