I find it very relaxing to dine at our resort. If you are planning to be at your resort for a rest time, I would say dining there would be an awesome option. I haven't been to Boatwrights so I really can't help with that.
OR
You might want to do late character breakfast that morning at one of the resorts. Since it is your rest day, I would try for the latest available. Sort of a brunch.
Also, I have not used the DDP, so I am not thinking of "What would be the most cost effective use of the DDP?" I think more about fun and relaxation. I do see you have two character breakfast already so you may be sick of breakfast.
It is not to late to make ADR's. I just made my Alfredo's and one for Chef Mickey's for dinner and was able to score reasonable times for both.
Can't wait to hear what you decide.