What about a visit to a city with a museum or something else you could visit indoors? With a cafe/restaurant you know they’ll like. It’s also less weather dependent
We're taking our LB to the aquarium in Hull, we live in Yorkshire, but maybe there is s9mething like that near you?
My eldest is born New Year’s Day. We’ve always managed the zoo or near us there is usually a circus around new year.
My little boys is also 5 on the 10th of January birthday twins lol 😂 but I found the same thing so I’ve decided to do a birthday party this year as it’s also what he’s asked for instead of presents x