UA 767s to Hawaii?

Hi all

My family and I are planning a trip to Hawaii this coming spring. Will
most likely fly on UA. Just wondering if UAs 767 aircraft have in seat
video or plugins for laptops. Just would like to know, as we will need
something to do on flight to Hawaii from DEN, SFO, or LAX. Also can
anyone post the address of the website (seat something .com) that
provides information on each airlines different aircraft and which
seats to avoid? I know we probably won't be able to pick out our
seats, as we will be doing a package deal and not booking the airfare
at UA.com, although we were put in Econ+ to London and the flights
were part of a package. I guess that was due to the plane being half
empty.

Thanks
Michael