Second Life was (is) a wonderful place - a persistent, single shard, shared virtual world where you could (can) do petty much what you want. Here are a few of the things I got up to.
We were doing a lot of work on 3D data visualisation, starting with getting Google Maps into SL. Then I thought why no The Traveller Map. Joshua Bell was actually working for Linden Lab (SL's creators) at the time! You could stand on the map and zoom i to anywhere in the Imperium.
The Empress Marava is a standard Traveller Fat Trader. I built it in Second Life, and then ported it OpenSim - the open source version of Second Life. Probably still on my hard drive somewhere!
Landed at a space port. The trick in SL was that the Marava stayed still but you rezzed what you wanted around it!
On the flight deck.
Looking at the navigation table - with live Traveller map!
In a state room.
The hold area.
On a Mars like planet with rear loading ramp down.
In space - everything de-rezzed!
Doing a space walk around a gas giant!
Back at the downport offloading cargo.