Return content with IHttpActionResult for non-OK response

For returning from a Web API 2 controller, I can return content with the response if the response is OK (status 200) like this:

public IHttpActionResult Get()
{
    string myResult = ...
    return Ok(myResult);
}

If possible, I want to use the built-in result types here when possible

My question is, for another type of response (not 200), how can I return a message (string) with it? For example, I can do this:

public IHttpActionResult Get()
{
    return InternalServerError();
}

but not this:

public IHttpActionResult Get()
{
    return InternalServerError("Message describing the error here");
}

Ideally, I want this to be generalized so that I can send a message back with any of the implementations of IHttpActionResult.

Do I need to do this (and build my response message):

public IHttpActionResult Get()
{
    HttpResponseMessage responseMessage = ...;
    return ResponseMessage(responseMessage);
}

or is there a better way?