Mary,

If the situation permits, please think in terms of an area that appeals
to a broad range of levels and types of access. The universal design
approach incorporates features that use a variety of sensesŠtouching,
feeling, seeing, moving things, levels of comprehensibility, etc. The 
result is an area that is more appealing and interesting to everyone,
including the target audience you mentioned. If research into the way
using more senses affects learning is true, it will be a longer lasting 
learning experience for everyone, too!

There is a growing body of literature on this topic. One report I can
suggest is Carol Hunter's "Everyone's Nature," published in 1994 by
Falcon Press (Helena, MT) for the Colorado Division of Wildlife.
It deals with standards for universal design, as does an excellent design
standards book (don't have the title, sorry) distributed by the Canadian
Paraplegic Association (613) 723-1033, but both may give you a lot of
ideas on possible directions the visually impaired and others.

Good luck,

Tom
-- 

Tom Vaughan    "The Waggin' Tongue"          
<[log in to unmask]>   (970) 533-1215           
11795 Road 39.2, Mancos, CO 81328  USA                            
Cultural Resource Management, Interpretation, Planning, & Training