...you would probably need to supply more info...

are driving? and from what direction? depending on your route you could do a lot of fishing on your way up through Michigan...if thats how your coming...

What kind of fishing do you want to do...trout, salmon, steelhead ect?

if its trout and you get past Sept some streams may be closed for the year...something to keep in mind.

if you plan on spending most of your time in the UP, shoot me an email and i'll give you a link to a site that has UP forum, you would probably do well to post the same question there...