Sign on the edge of a cross-country ski trail in Ontario, Canada
These &quot;what does this say?&quot; are a bit borderline for this site (they're not really about learning Chinese), and why I started the post How do I self-answer “What does this say?”.
Anyway, since I've read it already, and it's probably not that easy to use other methods...

这是私人领地。
This is private property
请不要摘蘑菇，野韭菜或任何其他植物。否则你将会遭到检控，因为这是非法的。
Please do not pick mushrooms, wild chives (?), or other plants, otherwise you will meet with prosecution, because this is illegal.
欢迎你在郊野小径散步，但地面上有雪的话，请不要入内（11月15日至4月15日禁止通行），谢谢。
[You are] welcome to walk on the countryside alley, but if the ground has snow, please do not enter (from 15-th November to 15-th April going through is prohibited), thank you.