holiday destination/club etc recommendations in Europe for single mum

How about Italy, not quite as full on family destination as Spain but hotels will have kids entertainment and lots of history. I love Sicily in particular but not sure it works without a car, though friends did manage without one near mt etna using public transport.

Have you looked at Eurocamp? There are loads of diff activities, and very family focused, and there is a single parent discount.

There are single parent holiday companies online and on facebook. We've used them for years for company for us both

Greece is lovely. There are also many parts that aren't overly touristy, but just enough. Which is why I go there. I have been lucky to travel all over Greece as a child with my parents. Always the quieter resorts and typically Greek. As a child I never really appreciated how beautiful the place is but I always loved our holidays. Now in my 30s I don't want rowdy places and appreciate the peaceful settings.

I've been with my young son two times already and will be going a third time in the school holidays. He will just have turned 5 when we go in August.
I am on a limited budget too. I did find going in the school holidays hard. It was about £600 difference from when we went in June. Alot of people have said why don't I just risk the fine. It would be a damn sight cheaper, but I don't really want to get into breaking rules.
We always go self catering. In the heat we struggle to eat loads so it's always cheaper for us to eat out.

Single adult holidays I feel are unfair. I have always paid more for me and my son to go away than my parents who go away at the same time. My son has always been charged as an adult and then under occupancy because the room only has one adult in. It's very unfair

Try searching SPTC (Single Parent Travel Club) on Facebook. Follow pinned post on their page to join the members only group. X

Italy is very expensive

Look at Portugal