1) Keep playing the game, then go back into My Dream. My Dream changes all the time, depending on how happy your Pians are, how many Pians you have, and what part of the game you just completed. The time of year also helps, and depending on the seasons the My Dream area will change. Just have patience, grasshopper.
2) Same answer as #1.
3) Stop breeding turtle Mepians, then.
and I did...I killed my whole population of turtles just to get the number down they just couldnt stop so I had to get rid of them all TT__TT