Sofa bed and chair are hard to sit on. The cushions slide but not bad for sleeping.
For a trip of 4 or 5 nights, plenty of food within walking distance, but for some of the more interesting options car or uber/lyft/taxi.
Cutting costs. If you get a 1 or 2 bedroom, cooking all meals will definitely cut costs. Or even getting prepared meals at Kroger/Whole Foods/Publix/Fresh Market. All fairly close by, but not all walking distance. My food costs in March were minimal because it was just myself and 1 grandchild. We did takeout at several restaurants, and also a bit of groceries and some breakfast from Tide Me Over, plus simple soup, salad and sandwiches. And Dole whips. I also always get fried shrimp and fries and coleslaw at Crazy Crab. It's my tradition.
I've kind of answered questions backwards, so getting to your first post: I think a 10 year old can enjoy a lot at HH. First of all, if she is not too shy to interact, the castmembers make it a point to be kind and friendly to kids in a good way.
There are a few activities to sign up for that can break the ice and make a child feel comfortable. On Sundays and Wednesdays Pluto is usually out and the kids get great one on one time - much more so than at WDW. And then every Cast member is a character (in a good way) in themselves. The recreation staff go above and beyond to be friendly with the kids. The resort is somewhat pool centric in a good way. In February many days are going to be cool for swimming but the kids are welcome in the hot tub/spa and frequently go back and forth to warm up. Hope the lovely lady who was talking to the girls doesn't mind getting added to Disboards!
Spa/hot tub:
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In February the ocean will be great for walking near and looking at, but not for swimming. Too cool. This is from a cooler day mid March 2020:
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We were there same week this year and it was quite a bit cooler. We wore jackets both in January and March of this year all but one day in March. In this pic the girls were dancing in the shallow water (2020). 2022, not so much!
This pic is zoomed in a lot from the dunes area. It is a very wide beach and there is soft sand near the dunes and flat and hard sand for biking and walking closer to the shore. The resort also has a walkway with a mat on it to walk across the softer dunes area and for beach wheelchairs to get to the harder sand.