Oh hey, I'm still working on this [Jap ver].
So, some tips:
1. You can interact w/ your well & get 500g
2a. The hotspring heals some HP (about 1 every 1 or 10 in-game minutes; forgot] [if you wanna cheat, the energy is HP; around 300 or 500 is enough]
2b. Similar you can go to the cafe & buy the menu to regen/heal.
3. Timeslots [6~9, 9~12, 12~15, 15~18, 18~21, 21~24] -- You won't be able to visit everyone within the 3h unless you cheat [variable 23 and 24], but each slot refreshes the affection gain from talking [not the daily one; only for town folks]
4. You gain HP5 by impregging; an easy way to gain a bunch is w/ the ranch/barn.
Eg. Buying the livestock girls, smex them, then selling them.
Edit: Though, do be careful, since you can't harvest from livestock if they're preggers.
Ps. Relation has some gift and choice guides.
Edit: Looks like the gift stuff might be rng, since the cheese soufflé didn't net like on the MTL ver for the bar lady [ps. Fav for her is gratin]
Edit2: Do note, if you're using the choice guide; I haven't finished the game, and was playing the Jap ver, so don't know if the choices may lock you out of marrying everyone. Remember seeing some harem-like choices when I used yandex's image translation.
Doubtful, since the game/dev didn't seem the type, but just here in case.