ISO Recommendations: All inclusive spa/resort Colorado, Wyoming, Montana, Idaho.

I’m looking at taking a trip for my 30th birthday. I’d love some sort of spa resort where I can lay in a pool and just look at the mountains. This would be for early/mid June and ideally 5-7 days. I don’t need to be in a location where there’s a lot to do off site. I’d be fine reading books and relaxing the whole time. I’m hoping some of you have recommendations on potential accommodation options! TIA for any suggestions!

An edit - I wouldn’t say I have an unlimited budget, but I do have a lot of wiggle room so I’ll take any recommendations regardless of cost.