I never ice fished Sylvan, but have fished it in the summer months - mostly at night while sitting back in my one-man pontoon boat.
Good bassin in the back of the lake near the stumps. I was targeting SM Piggies so I did not catch any panfish.
One night I was floating around and there was a big house party going on. I got invited to shore for a beer or 3.
Had a good time that night. For some odd reason, I can't remember ifthe fish were biting that night..
I have it on ice list this year. Will probably split a day and make it a combo trip by splitting time between there and Harris Pond or Moon Lake.