Time to blow the cobwebs out!
Buy (super)off-peak day return to Whitstable (last stop in Freedom Pass zone is Bromley South) before the day.

MEET: 10:30 Victoria Station by Costa near Platform 8 - for 10:40 train leaving from Platform 1 to Whitstable.

Optional 20’ boat trip round the bay (£10), market stalls round the Harbour area, and stroll along the front to the Old Neptune Pub to eat Fish and Chips on the beach. It has picnic benches right on the beach!

And if we can find it again, a fantastic gelateria we found last time!
We can walk on the beach, it’s pebbles so wear pebble walking shoes!
Slow stroll slightly downhill down to Harbour 20’, up again to get home. Public/café toilets, shops etc and lots of fresh sea air to blow the cobwebs out!

Pic from Wikimedia, Public Domain, https://commons.wikimedia.org/w/index.php?curid=2965323