Recommend somewhere for us to go for a short break

[Coffeesnob11]

My mum (80 next year) wants us (me mid forties ds almost 5) to go for a shirt break somewhere at the end of August. My mums mobility is good but she has been suffering from really bad tiredness (waiting for a doctors appointment to get blood tests). She wants to go abroad but wants it to be fairly relaxing. I will do all the childcare of my son. A pool and some sun would be great. Where would you recommend we go for 4 or 5 days?