Seacroft Lodge is in Skegness. It's a detached house, so you won't have anyone next door. It sleeps ten, in five bedrooms. There are four bathrooms, which is handy with that many people.
The main thing is the pool. It's heated and undercover, so you can use it whatever the weather. There's a hot tub next to it, and a sauna inside. There's a lift between the ground floor and the first floor. The stairs are normal.
You can walk to the beach and the seafront in a few minutes. There are shops and pubs on the way. The garden is enclosed.
Facilities wise: it has a dishwasher and washing machine. Bedding and towels are included. There's a cot and a stairgate if needed. Parking is on site. No pets.
If you want to plan trips, Visit Lincolnshire has good information. For walking along the coast, the Lincolnshire Wildlife Trust manages the nearby nature reserves.