I like to help, so I'll try.
But just so you know, I don't know if these are right so you might wanna wait until someone better at Japanese comes along:
There are four seasons in one year. = 一年間には、季節が四つあります。ichinenkan ni wa, kisetsu ga yottsu arimasu.
There are various things that you can do in certain seasons. = ある季節にできる色々な事があります。 aru kisetsu ni dekiru iroirona koto ga arimasu.