Read Nefesh Shimshon on Shabbos/ Rabbi Dovid Meisels’ Shabbos Secrets.
Bikkur cholim should not scheduled specifically and exclusively for Shabbos, according to halacha.
Re “taking a walk”: See Zichru Torath Moshe, Chapter 10, about those people whose evil inclination entices to take ‘walks’ supposedly in honor of Shabbos.
Rav Miller zatzal also has some nice Torah about the greatness of Shabbos.
About the salami – what you did was an act of piety (to save it for Shabbos). From the letter of the law, you could have eaten it during the week. So probably a step in the right direction.