Whats is this movie

Okay so A bunch of Students in the USA go on a bus trip to visit the president or someone of importance beacuse their class made like a good letter or something. A couple of things I recall are there was a very horny blonde,the bus ended up going into a lake, and the rooms in which they were in there was a mirror from which one side could see to the other one.

“Senior Trip” (1995), also known as “National Lampoon’s Senior Trip”?

IMDb synopsis:
" While on detention, a group of misfits and slackers have to write a letter to the President explaining what is wrong with the education system. There is only one problem, the President loves it! Hence, the group must travel to Washington to meet the Main Man."

Quote from the above Wikipedia page:
“the bus nearly plows into a lake. Dags manages to stop it in time, but the car lands on the water and Travis escapes.”

Yes thats it, thank you very much mate.