It depends how you left it in the autumn. Mine still has to be weeded and rotavated/dug, but I'm on a light soil so I don't leave the surface exposed in the wet months. What type of soil do you have? If it's clay then it's worth digging it roughly and leaving the clods to be broken down by the frost. Manure should really have been dug in in the autumn but it's not too late to do it now, if you have good well rotted stuff, or if you do no-dig then cover the surface with a good layer of mulch.
There are a few seeds you can sow already if you want early crops. Chillies are worth getting started early indoors or in a heated propagator, possibly tomatoes too depending on your local climate and last expected frost. Salads and salad leaves can go in, and spring planting garlic. Broad beans can go in but are best in pots initially at this time of years - best either sown in Nov or wait til March and they will soon catch up. Cauliflowers and early Brussels sprouts can be started off either in a seed bed or modules
In the tunnel, I'm not doing anything yet. The soil is clear and I have strawberry plants for summer growing and winter brassicas cropping now. We will have plenty more frosts here yet so I don't fall into the trap of getting everything planted at the first false spring - it will end in tears

You can cover bits of your outdoor soil with clear polythene which will help the soil to warm up. It will also encourage weed seeds to germinate ie creating a 'false seed bed', so you can hoe off those seedlings before you put in your crops and fewer weeds will emerge later.
I'm sure there's plenty more you can be doing. I still have my seeds to order, but as I have enough of most things left from last year I only need a few packets such as parsnips, which need fresh seed each year.