Nowadays internet can not only be used for information or educational purpose but it can also be used for entertainment purpose.Playing game is one of them.There are several types of games that people enjoy to play but nowadays people even seem to be attracted towards playing casual games, since they are easy and non-addictive.
Whenever my cousin ask me for games I just goto miniclips.com which have really good collections of small games which seems that games for kids... but sometime I can't resist myself playing that smalls kids games more than an hours... I like to play games on miniclips.com
The internet has an infinite amount of possibilities. To add on to what you said, you can also open up a business, make money, and do other things in that category. If you're looking for casual games to play, I would recommend RPG cause you play it casually throughout the weeks and RPGs have endless amounts of quests, leveling, and exploring that you can do.