Definitely swap all bulbs for LED – interior especially in case you leave them on. I did front console, sliding door footwell and interior overhead and DRLs as well, cool white look much better than poor halogen yellow.
Swap headlight bulbs for Osram Nightbreakers – getting into the bulbs is tricky, reach behind, find the wire and push towards the bottom of the van.
I also swapped my orange indicator bulbs for chrome for a clean look.
Small subtle and cheap tweaks to make it ‘yours’.
Tailgate downlighters are superb, had them on my Vito, not done it on the Kombi yet but miss them. I’m getting a 3 way switch in the head lining so I can have the tailgate off/on/switched, same as the interior lights. Put the switch out of the way so a load doesn’t knock it.
Caravelle is lowered 20mm already I think but something like H&R’s can improve look/ride for not much.