Dalgarven Spa House is in Dalgarven, Ayrshire. It's a big place for a group, sleeping up to 29.
It has nine bedrooms and each one has its own bathroom. It's rated 4 Star. It's set up for parties and gatherings. There's a private bar, a function room, and a games room. The main draw is the spa part: there's an outdoor commercial hot tub that fits ten people, and an indoor thermal suite with a sauna and steam room, just for your group. The hot tub area is fenced off for privacy.
The house is in the countryside. There's a local pub and a shop about two miles away. The coast is about seven miles.
For things to do, the area is good for walking and cycling. The Ayrshire Coastal Path is a long route right along the coast. You can see Arran from it on a clear day. Culzean Castle is a popular visit, run by the National Trust for Scotland. There's a lot of golf, including Turnberry. It's Robert Burns country too, so there are related museums and sites if that's your interest.
You can drive to Glasgow or Stirling in under an hour, and Edinburgh or Loch Lomond in about an hour and a half. Ferry ports for the islands aren't far.
Facilities include a woodburning stove, dishwasher, on-site parking, and WiFi. Bedding and towels are included. They have a cot and highchair. The entrance is wheelchair accessible. No pets.