i agree -- this is a great opportunity. Tilden and i got the chance to participate in an elementary schools 'career day' where i went over pet related careers, careers for the dogs themselves, and responsible pet care. Tilden did so well, especially with the autistic kids, that we've been asked back several times and eventually i'd like him to earn his TDI (therapy dog) but he is still having some issues with separation.
as far as tips:
get a letter from the principal stating that she's aware of Starks visit (since you have no organization ties or certifications) -- that way if something happens (there is more to worry about than just bites -- scratching a kid, causing one to trip and fall, asthma attacks because of allergies, etc) it'll fall back on him/her.
be prepared for the kids to completely ignore any and everything that you've told them prior to bringing Stark into the class (also be prepared for the kids in the school yard, in the halls, etc -- they'll seriously go NUTS)
*there will always be one really dramatic kid who pretends to be terrified just for attention, lol.
if Stark knows any tricks, they'll get a kick out of that...
and one thing that i do when i'm visiting a class for the first time -- i prepare a flyer that says "Today I met Tilden..." with a photo of Tilden and a short bio with his age, breed, favorite toys and activities, etc. This always goes over really well and i choose two students to help pass them out.
best of luck!
ps. don't feel too pressured to take photos. at least i know our first time, i didnt have a spare hand or eye... but if the teacher could get a group shot of you guys - that'd be awesome!
eta: here is a thread i started before our first visit.
i didnt read thru it again, but there may be some pointers or ideas there.