Translation of Schlammlawine

I arrived there but could not find a hotel immediately, so that I took my luggage with me. I know that this is very provocative to thiefs. One should not walk on the street with a big backpack.
Every school has some narrow minded teachers who are not willing in investing in progressive educational process. They do not grasp that schooling methods today are different from last century's methods.
I boarded the AA flight to Cancun, and got there around two o'clock. It was my first time in Mexico. On the same night I had a flight booked to Havana, but I did not know whether I should take it.