We take a bag of monkey nuts to the Grosvenor gardens in Chester and hand feed the squirrels. Then it's a short walk to the riverside where we get ice creams, etc. You can get a river boat from there (big one!) for a 'cruise'. A wander round the shops is then only minutes away (including the massive M&s) which 64 year old may like!
Funny you should mention river bramblebooks - we ended up at a water park and went for a swim - at least that's what it felt like . I have never seen so much rain in a short space of time and I have never been so wet fully clothed ever. Hmmph