perform a function or duty in, on, or in relation to that Te Arawa lakebed.(2) The rights and authorisations preserved by subsection (1) include, but are not limited to, a right or authorisation to???(a) place or install, permanently or temporarily, a structure of any kind in or on a Te Arawa lakebed:(b) enter and remain on a Te Arawa lakebed to carry out any activity, including to gain access to