I park mine in neutral with a block against the wheels, and a note inside the car to remind me of the fact (not that I would try and drive off with the block there of course). Handbrake off, if I remember I put a bit more air in the tyres but I rarely do as I try to drive it occasionally. Rechargeable dehumidifiers on the dash ( make me feel I'm helping even if they don't), leave windows open a little. Car is parked outside with a cover plus straps between it and the car to keep an air gap. Remove cover on dry sunny days. Charge the battery from time to time, hardly seems to need it but it keeps it full for when I do take it out.
The weather is so warm at present that I used it yesterday to do some shopping, roof down of course, it was SUPERB, hope to use it again next week - will need some of that liquid gold in the tank though.