I have been putting a grammar course on-line, with answer keys, and I'm wondering how members of ATEG would explain "as many travelers will remember" in the following sentence from the opening paragraph of James' "Daisy Miller":

There are, indeed, many hotels, for the entertainment of tourists is the business of  the place, which, as many travelers will remember, is seated upon the edge of a remarkably blue lake--a lake that it behooves every tourist to visit. 

You might also want to comment on the function of the "for" clause. I will probably include some of your comments as notes ― disagreements :) ― to my explanation.

Thanks,
Ed