Brochures rarely dwell on the possible dangers of an adventure. You would not have to tell anyone what to take, as people went in their normal clothing - working/hunting rather than evening clothes. Or are you gong to let them take servants along with them?
'This will be a small expedition, challenging those who wish to see new pristine vistas. You and your fellow travelers will forage in this bountiful land, under the guidance of our 4-star chef, to experience the best that Nature has to offer. Climate in the area, while welcoming, can change quickly. Garments consistent with inclement weather should be included. Travel will be on foot and by ship. Horses will be available for rent in some areas at an additional charge.
Accommodations will be rustic but of the best quality. Your stay in settlement areas will allow rest, recuperation, and town pleasures.
Your safety is paramount, and suitable precautions regarding the native populations have been put in place. Some travelers might wish to bring preferred personal defense items.
Various diaries and journals of prior travelers are available upon request.'
Doing it seriously, but with a sly sense of humor will make the brochure memorable.
Over-the-top descriptions, saying a lot without promising anything are typical.
Champlain was in North America/New France during the early 1600s. You might also look at things that were important in early 1600s - like the Church, and perhaps include a priest in the staff.