Mochii Yogurt on 16th & P. Excellent frozen yogurt with interesting toppings. Gunther's has their Pumpkin Ice Cream out now, close but not in the core.
An off the wall suggestion - contact Waterboy and see about a special Dessert-only meal.
1530 16th St, Sacramento, CA 95814
Gunther's Quality Ice Cream
2801 Franklin Blvd, Sacramento, CA 95818