Eminent domain is when the government is allowed to take property away from private citizens, without their consent, for “public use”, but is required to give that private citizen a “fair” value for it, a value the government chooses.
Taking someone’s stuff without their consent is wrong. Having the government take someone’s stuff without their consent is wrong as well, even if it’s for fun bike trails, and even if they give you some compensation for it.
Property rights is one of the basic, fundamental rights of any individual, and eminent domain violates those rights.
I love bike trails, but not at the cost of individuals losing their property.