What time of the year are you going?
What are some activities you like to do?
How long are you planning on spending in the area?
Couple places I know of are as follows:
Patricia Lake Campground (Minocqua, Wisconsin RV Campground and RV Park - Patricia Lake
Arbor Vitae Campground (Arbor Vitae Campground
Indian Shores (Indian Shores Camping & Cottage Resort, Marina & Restaurant - Home|Campground and Cottage Resort
I'm sure there are others, and I really only have experience with Indian Shores.. but I've heard of them and things were positive..
As to Indian Shores.. its a nice campground.. but I will not go back.. I had a bad experience with the owner/manager.. I'll leave it at that.. Its a nice place.. nice location and nice amenities... but I'm not a fan of the owner..
As for the area... wow.. couldn't ask for a better slice of Wisconsin.. great people.. great area.. beautiful clean/clear lakes..
St. Germain is nice, but I believe most of the action will be in Minoqua and/or Eagle River.. I know all three are nice.. but I think Eagle River and Minoqua will offer more activities.. but there is plenty to do in the area... Once you let me know what you like.. I can maybe direct you better..
Very excited for you.. we go to a HD rally in Tomahawk, WI and we usually ride to the above mentioned areas.. very nice quaint main streets.. lots of shops to visit.. lots of crafts and, of course, bars...