The ideal day requires a combination of intellectual and physical labor, capped off by some entertainment, socializing, recreation, or reflection. A mixure adds to the enjoyment as only having one element would eventually be boring and exhausting. Achievement in some category is also crucial, even if the achievement consists of catching up on rest or making one important decision. The days that are truly demoralizing are those when we achieve little or nothing. On those days, we neither rest nor work effectively.
So if we are seeking the ideal day, I submit that we should strive for mixture and achievement.