Before you resort to doing either of these I would look at ways to make the land accessible. This may mean a large culvert, or maybe an easement through a neighboring property, which could make it more valuable and usable. Depends on what is making it inaccessible (e.g. land locked, waterway, etc).
Donation could be an option, but then the charity will be facing the same accessibility issues to address that you do today. And for the conservation easement the appraised value of the property will dictate the extent of your tax relief. If the property is only worth 10K it may not even be worth the hassle.
Consider putting some goats out there and growing some big hardwood trees. Grass stays mowed and the hardwoods can be a trust fund for the kids in 30 years. You'll also be able to get an agricultural exemption in most states with such a setup, which would keep taxes extremely low in perpetuity.