Who needs a key to a weekend place
A house by the water gets used by more people than the owners: grown children driving in for the weekend, friends borrowing it for a few days, the neighbor who checks on it after a storm, the person who services the boat lift. Each of them either gets a key or calls you when they're stuck outside, usually at the least convenient moment.
Cutting enough copies in one visit, labeled by door, keeps the calls down. If the house runs on more keys than it should, front, back, side gate and the door in from the garage on different keys, that's worth fixing at the same time so each guest carries one key instead of a ring.

