My vote for WSM.
Things to do don't forget the Museum - it is tucked away but findable on Google Maps and good for a rainy day hope you don't get too many of those.
Personal favourites, the Italian restaurant in Uphill called - Tarantella I think, not sure if eat out to help out still on.
Sand Bay, there is a coffee shop and the area is really a nature reserve type thing.
Other restaurants shops area around the winter gardens has a lot to do in terms of street food if the sun is shining.
Premier inn on sea front (ask for a bigger room if you have a disabilty)
Royal Hotel you can google I wouldn't eat there but it is a nice building.
Cabot outdoors reasonable.
On the seafront Pierres the round building is nice.
Winstons good for fish and chips on seafront
Little shops orchard street still is good.
You can tell I like the place, yes, I know its a bit rough around the edges, but so am I!
You can try asking for a bigger room at Premier Inn if you have a disabilty. Given Covid you might even get a sea view.
If you want to leave the car at home taxis are cheap, you need a face mask.
two main taxi firms, especially if it is raining ask for a nice driver