You may want to do a web search for ST IV and Monterey Bay Aquarium. There was an exhibit there after the film opened, and a number of items, including whales, the SF GG Bridge forced perspective mini and the BoP were there... see if anyone here known to be in the Bay Area has shots or such too...
Also, the ST IV DVD has a few decent shots, but they're of the different versions of the ship (hero, detail scaled up, etc.)