Fiery Gizzard is located in the Grundy State Forest. This trail is one of the most scenic hikes around. It is also one of the most difficult, not only because of the length (10 miles round trip), but is steep in places and very rocky. However proportionate to the difficulty are the rewards.
The trail leading to the cache is often a bed of loose rock and boulders. Give yourself plenty of time and don't get in a hurry. The trail is marked with white blazes which you will need to take note of as you go, especially in the rock fields; just don't turn an ankle while looking for blazes. At times the trail makes unexpected turns or seems to go in a direction where in fact it does not. Remember - keep an eye on the trail markers!
The trail splits after a couple miles. Dog hole trail cuts back to the left and goes by the open entrance of an old coal mine and on up to the top of the ridge for a fairly level and easy path to Raven Point - once you make the ascent out of the gorge that is. I would recommend taking Fiery Gizzard going in and then Dog Hole on the way back out. While Fiery Gizzard trail is more difficult because of the rock fields, the abundant scenery is worth the effort.
Some of the sights that you can expect to see are many water falls, a tremendous variety of wild flowers in the spring (including Pink Ladyslipper!), blueberries in late summer, gorgeous views, a variety of rock formations (natural arches, chimney formations, and more), a large rock house near the beginning of the hike. Look for the 500+ year old Hemlock at the rock house - you can't miss it! Indeed this is a wonderful area that you will enjoy.
Take plenty of water, I would recommend 2 liters at minimum. There is water along the route, even in the dry seasons, so a filter would be a good pack item to lighten your load. Other recommendations are to bring light weight energy food, extra socks, and a dry shirt to change into once back at the car. A hiking stick or two is strongly recommended.
There is a primitive camp site near Raven Point if you want to make an overnight trip of it. Make sure to go the additional .4 mile out to Raven Point, it would be a shame to walk this far without taking in the gorgeous view! Also, there is a natural arch very close to the cache, check it out: N35 13.210 W85 44.388.
Finally, there may be a closer route to the cache than to take the trail, however that would require crossing private property, something that is highly discouraged - especially in Grundy County - just fair warning so that you keep tires on your car. Parking coordinates for the trail head are: N35 15.039 W85 45.147