Yeah, I have been thinking of just a basic fence for now, it would make it harder to walk there in general due to plants blocking movement, but once I get that fixed a fence will probably be the way I go about it for now.
Also, during daytime, enemies don't attack you unless you walk into them...at least ones that exist in game right now... the only exception is the Terror Bird but that thing lives in an arena of it';s own and it takes effort to get to in the first place.
With the latest map I'm working on, I'm trying to focus on more open space so the player can see the area around them better, so hopefully I'll improve on it from now on. In the far future I might find a way to fade out trees when you walk behind them, but at the moment the only way I know how to do that would require an astronomical amount of work.
The cost of performing actions actually does decrease when you increase your skill level and as you progress you can also increase your VP/WP pools so it feels even less taxing later on. Some players mentioned that they have set up a cooking/farming routine in such a way that they never have to sleep at all as the end product they produce replenishes them fully and has resources left over.