i have succesfully completed my wall. so i turned on the difficulty to normal.
went outside, killed a zombie. tried to kill a creeper - he exploded. tried to kill another one(who was on top of a tree!) and he fell on me....and exploded.
I started a new map. Now I have a non-built house on a sand mound in the middle of the ocean with a giant hole leading to a mine where I found gold and red sparkley thingys 10 minutes into the game....OH! And a cobblestone bridge leading to an island I found that is fulla trees! wonderful wonderful trees! I'll upload pics next time I play : )))))))))))