OK, I promised 3 itineraries but I'm going to beg off. By now you've seen a lot of the park and talked to a lot of people. You should have an idea of what you want to see or revisit. You can use the two itineraries provided to to plan those days and then decide on day 3. There also isn't a map for day 3 since you should be planning it yourself. The maps for two itineraries are still available.
You've still got geyser basins to visit. Midway Geyser Basin
is fairly small but has Grand Prismatic, the largest hot spring in the
park. Its close to Old Faithful.
West Yellowstone offers a
center for wolves and grizzlies. Since you're already there,
its worth a visit.
You can revisit Mammoth and sit in the
Boiling River if you didn't already. Its between Gardiner and
Mammoth. The walk from the small parking lot is a half mile or a little
more. No where to change, really.
If you haven't had enough of the Falls and Grand Canyon, you can revisit
them. Go see Lookout Point, Inspiration Point and Artists Point.
Revisit Hayden Valley. If its early to mid June, I don't think the
time of day matters too much. Later on, get there early or in the
Same thing with Lamar Valley. We seem to get out there every day
no matter what else we do. Take time with your binoculars and
scopes to check things out. We saw more through our scope than we
did up close.
If you haven't already, go see the Visitor's Center at Canyon.
Especially if you have kids with you.
There's a new visitor's center at Old Faithful. Check it out as
Probably, you haven't seen the West Thumb Geyser Basin. It isn't
very large but is interesting. If you drive by it or Grant
Village, stop and check it out.
If you think you found something better than what's here, you're
probably right. Go see or do it.
I'll try to add a list of hikes some time too. If you're there for
3 days, you have time to see a lot of the park and go for a hike as
well. We did go on a hike at Mammoth on the
Beaver Ponds Loop Trail. Use the browser back button to return
from the index page if you click the link.