Please can you recommend a child-friendly hotel ?

[curtaincall]

Our summer holidays have fallen thro' due to ill health and
family problems.

We want to take our 6 year old for a few days on a bucket and
spade holiday next week. May be too late as everything seems
to be booked up in uk (SE and SW). Have tried and failed for B&Bs,
yurts, featherdown farms, hotels, everything. Desperate to get away.

Can you recommend ANYTHING at all please?

Thank you in advance.

Haven Littlesea have availability, and theres a bus direct from the site to Weymouth beach (which is really lovely) every 30 mins

thank you :)