General Chinuch Guidlines:
-- In compliance with the warnings of the gedolim about the dangers of the internet, it is prohibited to have internet in your home (even if you feel that you have safeguarded against access by children). In the event that internet access is a business necessity, the computer must have a password and be physically locked. Additionally, the Yeshiva must be told that you have internet in the home.
-- Non-Jewish magazines and periodicals are not permitted in the home.
-- Children should not listen to the radio. (It goes without saying that watching television, DVDs or videos is forbidden.)
-- Children may not visit the public library even with adult supervision.
-- Non-Jewish reading materials must be carefully screened by parents before being made available to talmidim.
-- Talmidim must refrain from following professional sports as it is not in the Torah spirit.
-- Talmidim should not play games on the computer or use a game boy.
-- Talmidim may not own palm pilots or cell phones.
-- Extreme caution must be exercised in relation to trips or visits to non-Jewish places.
While some of these restrictions make sense (hey, I'll give credit where it's due), others are a bit odd and open up the door to restricting just about anything and everything. Examples?
Playing Scrabble - forbidden. Not in the Torah spirit to play a meaningless game where one has to memorize and know obscure English words.Going to a pet store - Use extreme caution - a non-Jewish place. In addition, there has long been a tradition against Jews having anything to do with dogs anyway.
Playing basketball - forbidden. Not in the Torah spirit, borders on Chukas HaAkum and may also lead one to start following professional sports.
Sending email to relatives in Israel (or elsewhere) - forbidden - Internet. In addition, who knows what materials they might receive from the relatives.
Family functions where non-frum relatives might be present - not relevant to our buchrim, of course - if you have a non-frum relative you wouldn't have been accepted into the yeshiva to begin with.
Visit to Museum - forbidden. We all know that dinosaurs were created by evil, atheist scientists solely to lead us astray.
Reading Magic School Bus books - forbidden. Contains magic. In addition, children will be told that the Earth revolves around the Sun instead of the other direction.
Visit to Zoo -- forbidden. Children may become interested in evolution, or even if not, it will surely be mentioned by some of the zoo guides. In addition, during the warmer months, there may be women dressed inappropriately.
Going to a Seforim store - forbidden. Children might see books by heretics whose books have not been removed from the shelves.
Except for maybe the last one (where I am exaggerating, but not by much), I can see all the above activities (and many other similar ones) being forbidden by schools based on the principles stated in the letter above. I'm left wondering why these schools don't just put out a list of accepted activities and say that children who do anything else will be punished.