I'm not Sioux or Lakota, so don't know the answer to that question. 

Would I be happy to be able to bring suits against the US to enforce my government's rights? Yes.

Here's the current framework for establishing/enforcing Hawaiian rights and claims in the specific areas where we are afforded protection and consideration by the federal government. There is no currently recognized Native Hawaiian governing entity (NHGE), and so most federal statutes envision "Native Hawaiian organizations" (NHOs) which are afforded consultation rights in certain matters. The Native American Grave Protection and Repatriation Act, or NAGPRA, is an example. An NHO can bring suit in federal court laying claim to certain funerary objects or remains and can even enjoin construction if successful. 

But who makes up the NHOs? Do all Hawaiians agree with their decisions or actions? How are they accountable to Hawaiians? They aren't, not really.

So I'd prefer a duly elected government to do that, definitely.