Hi, and welcome.
TBH finding suitable sibbing venues within easy reach has been a bit of a challenge (for me anyway), but the lakes is worth considering, Ullswater, Coniston, Windermere.
We do not do many single day sibbing adventures.
We take our sib when we go camping (Motorhome) so we find Campsites with direct access to water so that we don't have to move once we are set up, and we then get plenty of time on the water.