Well I assume the adults do what most humans do, besides the going-to-work thing. They keep an eye on their kids, not constantly, but they do check on them. They try to stay in hearing range of their kids so when they call for help, they can be there quickly. Take the first dramatic scene from The Land Before Time II: The Great Valley Advenure for example. When the gang of five was in trouble and yelled, every single one of their families heard and came running. They hold meetings occasionally to discuss matters of importance. They even keep the valley clean after things like storms. As for pleasure, I never see them playing around; I suppose watching kids at times and chatting is just as enjoyable for them. They try to keep a lookout for any unusual activities. They enjoy walks with there familes, considering I see Topsy walking with Tria frequently. They try to give advice and be examples of it. All and all, I'd have to say the aults are content but probably don't lead exciting lives anymore, except for a few times like trying to fix the thundering falls (III), looking for a temporary home (V), visiting far off places- adultwise, just the grandparents- (X), and fighting off invaders (II). While they seem happy, I can say that in The Great Valley I would be a little bored as a parent and even worse off as an adult with no family that is either too old to court or simply doesn't want to. One last thing is that Littlefoot's grandparents have no choice but to eat most of day. Think of how many thousands of little leaves it would take to fill a stomach the size of car!