Travel cot. And pack it where you can get it out straight away.
It’s the first thing we unpack, toss toddler in with finger foods and toys whilst you get the tent up.
If you’re buying new kit there are tents with black out bedroom areas, otherwise just accept that you will have early morning starts - have some quiet toys and instant food available - I put them in the tent pocket by my head then fire them at the travel city as needed.
Layer up massively with winter vest, long sleeve tee, pjs and fleece under a grow bag or sleeping bag.
Take more clothes than you think you’ll need as crawling makes for ridiculously wet damp trousers. Snow suit or puddle suit fab and a high vis one useful if you have a runner!
It’s a great age really - not potty training so no need to be balancing camp loos in the tent or trudging over to a toilet block at toddler intervals. Lots of fresh air and running around opportunities so some really good heavy sleeping.
And the ability to sit outside the tent and enjoy being adults rather than sitting in the dark in a hotel room.
If you get a choice of where to pitch, aim to be as far away as possible from any child’s playground unless you want to be pushing swings from the moment you unzip the tent in the morning.
We like a site on a farm or with animals somewhere. Easy activity is going to count the piggies or watching the tractor or whatever it might be.
And take a giant squashy plastic bucket. 3 inches of water and a squirt of fairy liquid and you’ve got an instant bathtub, and the sides are high enough that it keeps the wind off. You’ve also got something to swill bedding in if disaster happens. And works as a good containment device instead of a high chair - dump child and food in it together and you’ll not be picking mud and grass out of dropped meals.