For 6 nights land/4 nights sea you are going to have to book separately 1 of 2 ways. The first way is to book the 3 night land/4 night sea and then add on the other 3 days on a separate reservation. If you do that, you can get the dining plan for the 3 add on days only. The second way to go is to book the 4 days cruise by itself and then book the 6 nights on land. If you do that, you can get the dining plan for all 6 nights. We have found it to be more cost effective to book land and sea individually.