Jean is a good fishing lake, you can get the Grand Slam there with a little effort.
It's sees considerable pressure as a main destination and as gate-way to Sturgeon down Jean Creek.

Jean doesn't have many campsites for lake that size, so I'd take that in consideration.

If you have a depth/fish finder, you might run the south shore. There are at least 3 cold water springs that allow the Lakers to stay further up the water column than they normally would that time of year.

I don't use one or a GPS, so I can't give you the exact location, but even without electronics, you can find them with a little effort.

Jean can get pretty choppy on occasion. Not a lot of shelter north or south shores, so don't get caught in open water if the weather is iffy. Winds that time of year run west to east normally. If you want to fish the western end, I'd paddle down early light and let the wind push me back ;)

Little Jean has good Smallie action and has a few campsites that our out of the way, yet allow easy access to the main bodies of Jean.

I'd give Ceph lake a look too. Plenty of reeds in there. In May its full of Smallies and NP. Short portage at the SE end leads into Burnside Lake and good Waldo action around the island campsite and the numerous rock piles. Easy day trip. Portage is maybe 75 yds tops.