Ohana is a character dining location during breakfast and a table service location for dinner at Disney's Polynesian Resort. For breakfast you can meet Lilo, Stitch, Mickey and Pluto in their Hawaiian outfits whilst you enjoy a family style buffet breakfast.
Ohana serves only breakfast and dinner and prices range from $35-$60 per person plus sales tax. If you are on the Disney Dining Plan, Ohana is one Table Service credit. Both breakfast and dinner are all you can eat family style buffets with a Hawaiian twist.
1900 Park Fare is a character buffet table service restaurant at Disney's Grand Floridian Resort. For those of you on the Disney Dining Plan, 1900 Park Fare is one Table Service credit; if you aren't on the dining plan expect to fork out up to $60 per person depending on the time of day of your reservation.
1900 Park Fare sticks with the intricate Victorian theming of the Grand Floridian with hints of Mary Poppins and an English tea room (sort of).
You have a variety of options for getting to the restaurant, dependent on where you are coming from. My top route is taking the boat from Magic Kingdom directly to the dock at the Grand Floridian and taking a casual walk through the resort and into the back of the main lobby where the restaurant is situated. You can also take the resort monorail, drive directly to the Grand Floridian and park in the car park, or walk over from the Polynesian.