Hvar or Korcula or something else?

We are spending four nights on Hvar travelling from Split and then travelling on to Dubrovnik.

We have 2 extra nights to fill in-between Hvar and Dubrovnik- my question- should we spend two nights in Korcula (ferry arrive fairly early in the day from Hvar to Korcula), or should we stay put for two more days on Hvar (bringing to total the number of days on Hvar to 6).

I’d like not to be rushing around too much, on and off boats, but at the same time Im worried that we might get bored spending 6 days on Hvar??

Really looking to spend most of our time chilling out on the beach, not really interested in museums etc – will there be enough in the way of beautiful beaches on Hvar to entertain us?
Or should we visit Korcula?

Any opinions would be greatly appreciated. Thanks