Here is what I wrote:
kimi wa, 'watashi ni tegami o kaite kudasai', toiimasu, dakara, kakimashita. koko no tenki wa totemo ii desu. tenki wa hareyakade, atsui desu. watashi wa kyou ni POKETTO MONSUTAA o asonde, benkyou shite, shinruigaku no kyouhan o yomishita. ima no gakki no gakkyuu wa omoshiiroi desu. shinrigaku was benrina, dakara daisuki desu. nihongo wa tanoshii ga, muzukashii desu. nihongo no kousa no toki, unto benkyou shimasu. kimi no gakkyuu was dou desu ka. kaettetoki ni, MIRUKU SHEKU o nominagara, eiga o mimashou. tanoshii desu! fuke desu. nemuttaho ga ii desu.
And here is what I was trying to say:
You said, “Please write me a letter”, so I did. The weather is very nice here. It is sunny and warm. Yesterday, I played Pokemon, studied and read my Anthropology textbook. My classes this semester are interesting. Psychology is my favourite because it is so useful. Japanese is fun, but difficult. When it is time for a test in Japanese, I study very hard. How are your classes? When I am home, we should drink milkshakes while watching movies. It will be fun! It is now late and it would be better for me to go to bed.
Also, at the end of our assignment page, there is a highlight portion that says "soredewa kyoo wa kore de shitsurei shimasu. dan dan samukunarimasu ga okaradani kio tsuketekudasai."
Could anyone translate this for me?