Bay Area geezer grandparents eager to get the kids to drop their Gameboys for a few minutes, should steer towards Pt. Richmond. Starting April 3 the massive Golden Gate Model Railroad Museum opens on Sundays from noon to 5. It houses 10,000 square feet of track, lovingly recreated California landscapes, and dozens of impeccably restored trains. Model railroading is the 3rd largest indoor hobby in the US (behind stamps and coins). Who knew? $2 for seniors and children under 12.