1. Clean up your raised beds & till the soil, to "fluff" up the soil aka aerating it and promote growth, cover them with plastic to warm up the soil or plant some cool weather crops like peas, onions, cabbage, lettuce and broccoli.
2. Check soil for any necessary adjustments, pH balance kits can be purchased for cheap, or just add some rich compost.
3. Make any adjustments to your beds now before its too late -- I moved one of mine and added a fence so I don't have any unwanted guests this year. Also check to make sure they are good to go and don't need any repairs.
4. Plan what you are going to plant, and where you are going to put them, Maybe try some companion planting this season?
5. Start your seedlings indoors (if you haven't already), or you can always buy plants from garden centers or farms near you, they often have tons of options really good options. We have a ton of places around us, I try to buy from the smaller organic farms near us vs. the larger stores.
This is my garden 2015, I added a fence this year to keep the critters out, and moved all my beds to one location. I also added a fourth 4x4ft bed. (one in the back) I am hoping to have a higher yield, and sooner this season and maybe try a few new things. If I learned one thing last year it was to plant at different times so everything is not ready to be harvested at the same time. Last season I had enough lettuce to feed the neighborhood, but only for 2 weeks!