Best Luxury Upgrades to Add to a 30 Foot Boat?

[SecondBase]

I'm investing in a better sailing and liveboard experience. This will be hard and not quite true by assume all ships systems are in good order. I'm looking for a list of "options" - things you'd add to a boat such as: Hammock, Sirius XM lifetime subscription, wood stove, memory foam, etc.

What's the one non-essential feature you've added/seen that gives the most added enjoyment?

Open budget, constrained by hull length.