Favorite south eastern wisconsin lakes?
We have 98 named lakes in Waukesha county alone.
If you're new to boating I'd stay off Pewaukee during nice weekends in summer.
Lower Nemahbin. Keesus. Fowler. Ashippun. Plenty of people consider those their "home waters" for fishing but you won't have a mini-cigaret boat cut across your bow.
Delevan is great for certain species.
As is Pewaukee. As is Labelle. And so on.
There are quite the quality fisheries in southeastern Wisconsin. Sure they don't have the look or feel of a Vilas county lake, but the fishing is still quite good.