Listen to some Jazz
Go Jiving
Jump  – Base/Sky dive/In the sea
Enjoy a Jacuzzi
Jog 
Make some Jam
Do a Jigsaw Puzzle
Jousting (Seriously, it happens…)
Jet skis
Visit a friend in Jail, you know, if you have one there
Jersey Boys Show

Tourist Attractions
umm… 

Day Trips & Weekends Away
St James Park – Tube Station in London

and for the little more adventurous…
Jersey