Hello and Happy New Year to you all 
My mum will be 70 in March, and has been dropping heavy references to her 'big day' to one of my sisters.
(She's clearly decided she is to be the chief organiser.) When sis asked what she'd like, she said she would be happy with a meal at a Chinese restaurant but that is clearly not the truth!
We've thought about a weekend away, (her plus us 3 sisters) perhaps somewhere central like Stratford on Avon, as 2 of us are in London and the others in the Midlands. Nominated sis has also suggested hiring a boat but I'd imagine it to be a bit bracing in early March 
There are likely to be just 3 of us splitting the bill so we'd like to keep it under £400, definitely can't manage more than £500.
Mum is a fairly quiet but intelligent soul who enjoys books, history, wildlife and the countryside. She's reasonably healthy but not too energetic so we want her to have fun without exhausting her!
Any thoughts or suggestions would be gratefully received