Have you ever been skiing? Do you like it? Why /why not?
I like skiing and many times in a winter I do it. But I prefer not to choose not a high hills.
I like skiing and i do it many times in _ winter, but I prefer to choose small slopes.
(slopes, better than hills or mountains)
(you can not start a sentence by "But", "And", "Or"..)
I like skiing and I ski often many times in a during winter I do it. But However, I prefer to chose not a high hills stay on the easy slopes.
This is the natural way to express it.