We stayed in Burnham Market for a week last month.
Wells-next-the-sea is nice for a wonder and a beach. There’s a mini train that takes you from the town to the beach, or you can drive down and park 5”m from the beach.
Cromer is ok for fish and chips and a wonder along the promenade and pier.
Other places are maybe a bit far west if you’re staying in Bacton.