If you want to go for holiday that will make your kids (2-8 years old) happy, decide for Permonik!
We went there with almost 2,5 years old and she loved it, although some activities are more likely for children 4+.
There is a lot of fun indoor and outdoor for your children. Organized and non-organized.
Accommodation is clean and very nice. They have everything for kids ready.
The only pain for adults are the meals. They are rather weird, said to be adjusted for kids liking. And I suspect that the cook is just giving too much sugar into everything, which I do not like, as it is no good for kids anyway.
But it is worth it to survive with the meal and have happy child for one week :)
There are nice hiking opportunities from this place, some reachable with the sport pram. Also you can always go for trips by car, like Hradec Kralove ZOO etc.
PS: check hotel website. They keep their promises. We will definitely come back in 1-2 years, when our little one is older to enjoy more from the organized activities.