Download file and extract image. PNG file format. Not an in-game mod.

Version info:

1.5 Added unmarked sleeping locations, grey markers for interesting sites / graves with no loot. Numerically labelled all treasure chest locations with the roman numeral corresponding to their respective Treasure Maps. Includes marker for 'Secret' mineshaft.
1.4 Added legend for new map markers, identified Warhorse Armor locations (Treasures from the Past DLC), more unmarked camps.
1.3 Added random Battle Locations (Blue circle crossed daggers), compass rose
1.2 Added random Ambush locations(Red circle crossed daggers), Optional Skalitz Mine map file.
1.1 Added unmarked Bandit Camps (tents with skull icon)

Skalitz Mine Maps:
Upper Mine (Entrances S1, S2, S3)*
Lower Mine (Entrances S4, S5)*
Secret Shaft*
'All that Glisters' Quest completion cutscene location

*Mine shafts are limited access at different points in the game. Some routes that are open during DLC Quests are closed off during main quests.

Fun facts:
There are 253 'Interesting Sites' in KCD, 115 of them, or about 45%, have loot.
The largest concentration of loot is Vranik Forest, containing 22 locations.
The majority of the ones located near water will either have Savior Schnapps, Moonshine, or both (if marked as having loot).
The majority of no-loot sites are pagan worship sites. 
You are 3x more likely to encounter Cumans in the forest surrounding Pribyslavitz than you are in the forests of Talmberg or Vranik.
There is no 'safest' route for completing the 'Pilgrim' achievement.
The minimum number of shrine and conciliation crosses (if you admire the 37 murals) to complete the 'Pilgrim' Achievement is 53.
Vranik Fortress can be entered from the west before the story directs you there, but there is nothing of interest inside (might help to learn the layout in advance).
The Skalitz / Rovna region contains the most treasure chests, 8 and one Warhorse chest.
Talmberg Forest has the most random Battle locations, at 5.
Pribyslavitz Forest has the most random Ambush locations, at 7.
The safest region is the Sasau / Monastery Region, with 3 Ambushes, 2 Battles, and 5 bandit camps.
Pick 100 Nettles to get a free permanent +2 boost to Vitality, which helps a great deal this early on.
Yew bows also have the longest draw time, so in damage-per-second terms, an Elm longbow is superior, especially if you're using poison.
Sell stolen items to a miller, then a few days later, lockpick his inventory chest and steal all the Groschen he made in profits selling your goods.
~ wh_pl_showfirecursor 1  will show the reticle for the bow. You still need to use the target at an archery range to learn to compensate for drop.