A veritable parking lot.
I've ridden every mile of pavement in the park -
Plus most of the legal dirt sections. Since 1987.
You have a fairly long ride on Tuesday - -
At the very end - there is a loop out to Gull Point -
Just before you reach Bridge Bay.
It is a pleasant and quiet diversion.
Saves a bit of climbing - adds a couple of miles.
(Or you can head out to Gull Point on Thurs - usually empty.)
Lake used to be on the Grand Loop Road but it has been realigned.
Still, it is worth turning off - the views are spectacular.
Fishing Bridge has an excellent museum and short trail out to the lake.
(Many of the lake areas are closed in spring due to grizzly feeding.)
Give yourself plenty of time to enjoy the Hayden Valley -
The road is not great, but the scenery and wildlife are superb.
(They pave pull-outs for RVs - but cannot have shoulders - environmental regs, right.)
Do not overlook the south rim of the Grand Canyon of the Yellowstone.
The road ends at Artists' Point - with lots of tourists -
But if you hike out just 1/4 mile there will be almost no one.
Then get back on the loop road and take North Rim Drive to Canyon Village.
It is one way, so you cannot easily access it from the campground.
(They should have made it two-way for cyclists - but, but, but)
There are also great hikes from Canyon Village along the rim.
If you leave in the morning from Canyon you can tour Norris Geyser Basin -
Then have a leisurely, downhill run to Madison - getting in in early afternoon.
I might suggest riding down to O.F. in the late afternoon - stopping at Grand Prismatic Spring.
(There will be fewer people if you get there around 6:00 - 17 miles each way, lightly loaded)
Then a downhill ride back in the early evening.
Pic - Grand Canyon of the Yellowstone from Artist Point Trail