-After a quest/before leaving the game... always go to my House if possible. Take off all Equipped items, sleep or sit in front of fire as if to relax/rest/unwind...eat and drink something.
-Read the Books throughout Skyrim. ACTUALLY read them, not just read to get a power or level advancement. A lot of good lore, stories, and useful in-game how-to's in them.
-If/when I have had or might have a follower, if they die they are left in their robes with their weapon in honor and respect.
-Never kill wildlife with wild abandon- only as necessary, always take everything upon searching as not to waste.
-ONLY Fast Travel is if I am over burdened with items I want or need, and only after taking Potion of Strength for carry capacity, to sell them. Other than that, ride Shadowmere or walk if needing to be stealthy (Shadowmere doesn't mind he always finds me).
-Never advance Enchanting/Smithing by using the Celestial perks or by paying someone to advance learning. Want it to remain balanced as much as possible.
-If a Mage, then hoods off in civilian settings... but have a circlet now so doesn't matter. If Thief/Assassin hood remains on for secrecy.
-When talking with an NPC or other, always use all of the dialogue available.