First thing, everyone will ask for all the dimensions so might as well measure and get that done. :-) It does look as if the peninsula might be crowding the dining room, since you have shown the table not centered on the sliding doors, but there is only room for an island if you have 48" on all sides, and if the corner of the island is far enough away from the corner wall that there's not a pinch point. In either case, you should not put the dishwasher between the sink and the cooktop or range, as that creates a bottleneck. Also consider that the breakfast bar area, especially the coffeemaker, isn't very convenient all the way across the kitchen from the sink.

Putting a built in bench along the dining wall might free up enough space to make the peninsula option work. It wouldn’t bother you have the coffee station a few steps away.

I will wait for the measurements added to your drawings .

Island!

Get this entirely straightened out before you take down the wall, since keeping it may be the best solution. This dining room is going to be in daily use, and you don't want the experience to be cramped and unpleasant.

We have an oddly shaped kitchen due to a previous owner’s addition involving the space next to the kitchen, so we were limited and couldn’t push out into adjacent space when we remodeled a year ago. I was happy to get rid of the peninsula and make the island slightly bigger. It is nice to have some breathing space between the kitchen and dining room.

I'm allowing you to use that island/peninsula money for other things. With the area of your space, and the closeness of a comfortable dining table, I don't need either. Take the top layout and chop off the peninsula but include the end of sink run counter. You'll save even more by deleting the frig wall in the top layout completely. Move the frig to the end space created when you chop off the peninsula.

you will not want to forfeit the third wall..coffe/pantry/fridge. esp w a growing family . it is a key zone. However I would pull the peninsula in ..just a filler strip right of dishwasher....eliminate the corner cab...you can have a cabinet opening on dining room side of peninsula in that location.....put shallower pantry cab on lower wall so the walk through is proper at the end of peninsula and you may still get a 3rd stool...but where are the measurements ?? the U shape you mocked up is too wide for the overall space at hand...but thats the configuration I would pick... the third wall use is something to keep.....later on its a food setup for entertaining can you show the details of that wall?

U shapes can be tightened up quite a bit more than what you suggest in your plan . dont scrimp so much on space for dining area.....the U will be an efficient kitchen if you get it right. heres one without and one WITH peninsula seating.....

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I just updated post with dimensions. thank you to everyone who commented so far.

Just please allow 48" between the island and any adjacent cabinetry. Less than that will make using your kitchen difficult.

I agree woth dan - both options look to tight to me. You don’t have space for 48” around island and not sure on the penninsula spacing between table and counter but doesn’t look wide enough for a passage. i’d skip both and give the table room for folks to use it! no need for extra seating when table is right there.

you have sufficient length Left to right to have a U kitchen and a peninsula with stools. If you divide in half you will have 12 feet across for kitchen and dining each. A U shape can be fine with 5-6 feet across counter to counter. try reworking your kitchen U plan [ I dont care for the island plan at all] USE 12 feet for kitchen .....2 foot counter depth on left..... 7 feet across to peninsula side which can be a 3 foot depth peninsula giving you 12 inch overhang for the boys. You can reduce the distance across down to 6 feet for more overhang or slight increase on dining room width. When you look at your initial plan you gave 2/ 3 to kitchen and 1/3 to dining...change that. . Remember..pantry cabinetry can be reduced depth on lower wall to keep passage there and allow peninsula to extend that way. I dont think the island alone will be as nice as the 3rd wall bonus zone AND still have the peninsula WITH seating .

Thank you for the ideas!