To cover the Suffolk bit;
Dunwich: not a lot there, but interesting in a wildernessy and lost maritime history way. It’s at the end of the Dunwich Dynamo and has a forest for biking, but local knowledge needed really.
Southwold: The Waitrose of seaside towns. Very pretty, nice pier, Adnams brewery.
Aldeburgh: Another pretty seaside town, buy fresh fish on the beach. Nice walk out to Thorpness, which has a boating lake and some quirky landmarks.
Orford: Take the short ferry to Orford Ness to see the WW2 military testing sites. Tunstall and Rendlesham forests have plenty of MTB trails (the former being better). Then round to Bawdsey and Friday Street for more WW2 history, or take the foot ferry across to Old Felixstowe (nicer than new Felixstowe).
Woodbridge: Another pretty town. Sutton Hoo is very nearby.
Felixstowe: Typical seaside town.
Inland: As others have said, it’s not got the landscapes of the Dales or the lakes, but it does pleasant, picturesque, rolling countryside as well anywhere.