There are over 80 different quest to do in Fallout new Vegas
The original fallout has 3 tutorial quests, 11 main quests and 17 side quests. There are also 36 unmarked quests, 16 of them are repeatable. The 5 DLC adds 18 new main quests, 8 new side quests, and 7 new unmarked quests 2 of those are repeatable, making for a grand total of 57 marked quests and 43 unmarked quests.
There are many many many quests in Fallout 3. So many that it would be very hard for me to write them all down. Try looking it up on Google or Bing and see what you can find and if any websites have all of them listed.
There is many hidden quests in Fallout 3 but i there is one when you reenter the vault. (after you father dies) hang around the vault entrance.
http://fallout.wikia.com/wiki/Fallout_3_quests
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Kill people, do quests, pick locks, and hacking terminals.
I do
When hippos are upset, their sweat turns red.
I do
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No,since some quests require others to fail. However all AVAILABLE quests will keep ya playin' for a while..especially if u got the DLC's.
I dont think you can. As you can have many quests on the go, just choose which quest you'd like to do and leave the ones which you dont want to do.