1)What does the southern access look like (off Hwy.60)in regards to parking?
An excellent parking lot. Even a vault toilet.
2)Approx. how long would it take us (a few guys in our mid 20's) to get to to the 2 sites on the northern end of Thunder Lake or the southern end of Lupus Lake?
I have no idea.
There are two trip logs...
Go to AA's homepage, and click on "Trails", then go to "Interior". Don't know if they will help you or not.
3)If we're looking for a hike of approx. 4-6 hours our first day, what lake/site(s) would you recommend if we depart from either the southern (Hwy.60) access or the northern #4 Rain Lake access?
According to the Park's website, access roads, like the one to Rain Lake, are impassable.
http://www.algonquinpark.on.ca/news/spring_accessICEsafety.html
4)Any must-sees along the way?
Ummm....snow? Bare trees? Frozen lakes?
LOL, maybe you should contact the Park and ask them some questions.
Barbara