(Base Game)
I found a spot in Reaper's March that has quite a few torchbugs flying around.
The area has a lot of nereids and a world boss as well though.


(Base Game)
I found some more torchbugs in good numbers around the North East area of Blackrock Isle.
Around the areas of Frostedge Camp and Skyshroud Barrow. Mainly around trees it seems.


(Base Game)
These 2 areas seem to have lots of torchbugs dotted all over the place.


(Base Game)
There's a good amount of torchbugs here. It will also be a peaceful, uninterrupted collection if you have completed the quest here as the wildlife will be passive.

(🔒DLC - Summerset Chapter)
I found that Artaeum seems to have quite a few butterflies dotted all around the area.


(Base Game)
There's a good amount of butterflies here. It will also be a peaceful, uninterrupted collection if you have completed the quest here as the wildlife will be passive.

(🔒DLC - Greymoor Chapter)
I found that the waterways of Western Skyrim seem to be decent for finding mudcrabs. I was wandering around the middle of the map along the river and marshes and found a good handful of them in groups of 3 at a time.

(Base Game)
Around Voljar's Meadery in Eastmarch there's a bunch of chickens around 2 "enclosures"
✅ No NPCs watching them.


(Base Game)
Follow the paths around the West of the Temple of the Morning Springs in Kenarthi's Roost. There's a lot of sheep around here.
⚠️ NPCs watching them.


(Base Game)
There are lots of goats around the Goat's Head Oasis Wayshrine in Alik'r Desert. This is the wayshrine to Tu'whacca's Throne.
✅ No NPCs watching them.

I do recommend using the addon HarvestMap to tag all nodes you collect and find areas that work for you.

(🔒DLC - Summerset Chapter)
Along the path and surrounding area East of Sunhold in Summerset.

(Base Game)
The whole area of Bal Foyen is a very popular spot for resource node harvesting.

(🔒DLC - Summerset Chapter)
Artaeum also seems to have a lot of resources around.
This area also seems popular, as when I was trying to collect there were lots of other players here collecting as well.

(Base Game)
You can find fire, frost, and storm atronachs South of Willowgrove in Reaper's March.


(Base Game)
By no means overrun, but there is a decent amount of storm atronachs here if you need that particular variant.

(Base Game)
There is a public dungeon boss that you can get to respawn very quickly in the Lost City of the Na-Totambu in the Alik'r Desert.

As you follow the dungeon out into the open ruins, it's the platform on the far West side.

You need to stand on the pairs of pressure plates in a particular order to spawn them.
You can do this solo, just walk to both plates. The light will disappear when you match the right one.

Order:

1. 🪲 Scarab
   
2. 🕷️ Spider
   
3. 🦂 Scorpion

(Base Game)
These 2 world bosses are really close together, so you can run from one to the other to get your count up quicker.
There are 3 enemies to kill at both sites.
At Rootwater Spring, there are quite a few 🦋 butterflies you can collect to pass the time.
At Reconnaissance Camp, there is a 🎣 fishing hole you can use to pass the time.

(Base Game)
If you have an endeavour to kill a high number of "dangerous foes" I would recommend going to Craglorn and activating Celestial Rifts if you can. Take some friends with you if you need.

(Base Game)
You'll come across a number of Ayleid ruins that will be infested with either ghosts or skeletons.
One of these that I remember is Ezduiin (ghosts).


(Base Game)
Areas that are marked as graveyards tend to be populated with skeletons. Sometimes they will also have necromancers and other cultists though which won't count.

(Base Game)
Obviously.

(Base Game)
This area has quite a few daedroth and banekin.


(Base Game)
This delve is entirely populated with humanoid daedra.

I have found from exploration and cataloguing with HarvestMap, that most public dungeons should have a really good amount of chests dotted around.
You will have varying luck in finding them depending on how many other players are in there at the same time as you.

If you have an endeavour to loot chests, safeboxes count to this.

(🔒DLC - Blackwood / High Isle / Necrom Chapters)

Remember to upgrade their levels with the Fighters Guild, Mages Guild, and Undaunted.

During a XP boost event, I took Sharp-As-Night to a multitude of dolmens in base game locations to level him up. I managed to finish his last level fairly quickly.

XP scrolls do seem to increase XP gained by companions as well.

If you don't have the amount of furnishings/space/patience/etc needed for this endeavour, you can complete this by placing 1 furnishing then pressing "undo" and "redo" repeatedly until you hit the target.

(🔒DLC - Blackwood / High Isle / Necrom Chapters)
If you're looking to pick up heavy sacks or want to find more when exploring, I would recommend having a companion with you.

As I've been travelling around with my companions, they will randomly say something to indicate that there's a heavy sack or chest nearby.
If your companion makes mention of a bag or sack or loot of any kind, get searching.

(Base Game)
Crosswych is a fairly good spot for safeboxes I found. But I have had to "compete" with other players here for them too.

There's also good opportunity for NPCs that aren't too close together to get some pickpocketing done.

(Base Game)
A good amount of safeboxes here that are fairly easy to get, at the dockside market under the bridge.

If you want some better loot than just provisioning stuff from barrels and baskets, I recommend going to any place that has urns. They are more likely, I find, to have recipes, or blueprints, etc inside them.

Backpacks and furniture (like trunks and wardrobes) also seem to be good as well.

🌟 You might also want to have the Homemaker champion skill active.