Take the longest lens you have. I had a 75-300 mm lens for my Olympus EM-5 which becomes 150-600mm and could have used a longer lens. Also bring a monopod ,rain and cleaning gear.
thing I have painted for myself in a very long time. Now that I have retired ...almost ...maybe from doing commission work, I had a blast painting just what I wanted to instead of something to sell. Oh what fun!!!!