We have exchanged homes many times before and our exchange families always comment how much there is to do in and around Frome. There are many interesting historic buildings within the town and we are less than 5 minutes walk from the centre. Frome has a Sports Centre (with gym, swimming pool, badminton and squash courts etc), two theatres, a cinema and an Arts and Crafts Centre. There are two parks that have good childrens' playgrounds within walking distance. Our house is in a residential area and very well situated in the town, it takes a few minutes to walk to the town centre, and yet in ten or fifteen minutes one can walk to the edge of the town into open countryside. We have a vegetable plot on an organic farm on the edge of town and you are welcome to harvest our produce whilst you stay. Frome is surrounded by very beautiful countryside and woods, fields, hills, rivers, villages and lovely country pubs are all within easy reach by foot. We have lots of maps and the area is great for walking.
You might find these links helpful to research the many local attractions:
https://www.nationalgeographic.co.uk/travel/2021/06/what-to-do-in-frome-somersets-most-exciting-market-town
https://www.tripadvisor.co.uk/Attractions-g504128-Activities-Frome_Somerset_England.html
https://www.loveexploring.com/news/82927/weekend-break-frome
https://visitbath.co.uk
https://www.cntraveller.com/article/guide-to-somerset-uk