Any recommendations for places the immune-deficient can visit?

My sister is wrestling with some serious health issues, which in turn have hit her emotional/mental health hard.

She has MS, and was diagnosed with breast cancer at the beginning of the apocalypse pandemic. She is on a bunch of medications, and she is terrified of coming in even the most remote contact with people due to Covid. Along with her husband and 7-year-old daughter, she has been locked inside since March – except for hospital trips.

Recently, she reached out to a small local farm that has goats and small walking trails. She left them a voicemail asking if it would ok to come by when they are officially closed just for a few minutes. The person who runs the farm immediately called her back and told her that she is very welcome to come during unofficial hours. In fact, the farm has apparently done the same for others during the pandemic.

The experience was a very positive one – and one that was a healthy break for all, including my niece.

I’m now scrambling to try to find other opportunities for her to do something similar. My creative juices are not flowing, however, and I’m looking for suggestions.

tldr – I want to help my sister and niece get out and experience some sense of normalcy by finding unique places that will allow her to be alone with her family outside the house. Local trails and parks, etc have proven to cause her to lose it, as there are people not wearing masks.

Any thoughts?