If there was really a world-wide flood where are all the bones of the humans that drowned?

I believe there are few human fossils for several reasons.

1.  God made the world full of plants and animals but only two people.  1600 years later the world was still full of plants and animals but still not full of people.  There were not as many of them to be drowned.

2.  Men are smarter than animals (that is, some men), so he would figure out a way to avoid drowning until the last possible minute by making makeshift rafts or holding to floating logs and tend to be deposited on top rather than in the sediments.  Therefore he would not fossilize.  For example, millions of bison were slaughtered in the west a century ago, yet few, if any, fossilized. They were left on top to rot, bones and all. 

3.  Since so many researchers have the preconceived (and false) idea that man has been evolving from small and dumb to big and smart they may tend to not even recognize and properly identify bone fragments of humans that may have been huge by today’s standards.  Their prejudice is that ancient man was smaller.

In spite of the above problems, Marvin Lubenow, an expert on fossil humans and author of Bones of Contention (available from CSE) says that about 4000 human fossil remains have been found.

The evolutionist has a serious problem with this same question.  If man has really been here for millions of years there should be many thousands if not millions of fossils of their bones like we have of the animals.  The "where are the bones?" question is really a question for the evolutionist to answer if he expects all the taxpayers to support his religion in the school system.
 

The number of fossils in certain areas of the world is enormous. How could earth have supported all those creatures at the same time?

This question shows a common false assumption that many people make.  They assume the earth today is the same as it has always been.  Today's earth is 70% under water.  There are scriptural and scientific indications that the pre-flood world had greater air pressure, higher percentages of oxygen and carbon dioxide, much more land (above sea level), less water (on the earth's surface), and a canopy of water to filter out the harmful effects of the sun.  This would cause there to be many times more plants and animals on the earth than there are today.  The added air pressure would diffuse more gasses into the water and support a much greater fish population.  Aquatic plant life per cubic mile would multiply also. 

II Peter 3 tells us that the scoffers in the last days will be willingly ignorant of how God created the heavens and the earth.  They would also be ignorant of the flood.  These two great events must be considered before making any statements about the conditions on earth today. Only about 3% of the earth today is habitable for man. The rest is under water, ice, deserts, mountains, etc. If the earth before the flood were for example, 70% habitable, it could have supported a huge population. "O that thou hadst hearkened to my commandments! Then had thy peace been as a river, and thy righteousness as the waves of the sea." - Isaiah 48:18. 

The vast amount and world-wide distribution of fossils shows the flood was global and that God hates sin enough to judge the entire world.