Tubing at the Corona lake is best thing to do. Boat..not fun at all. If you're looking for cat during the early hours, along the shore line is the best. If you're search for them during the day, fishfinder will show their hidden location. Look for underground sunken areas, especially the grassy areas at the southeast end, or the northwest side (the dam). Bring out the stinkiest bait you can find (homemade uncured concoction of chunky mackerel 1"x1" square, sitting in a blended nastiness of chicken liver, chicken blood, a bit of Velvetta cheese for binding, a few hot dogs for chunky attractant of high nitrate content, 10% salt, and 10% granule garlic powder). Secret recipe from Aaron (the lake catfish expert) that I deduced over time from his posts.
The problem is, the catfish that recently get stocked are farm-fed channel cats. They like to go for live baits, or fresh cut baits. However, that lake is so filled with stagnant leftover, the holdover channel cats are not too chosey of their meals. So, fresh stocked, not so much going for the stinky stuff. The larger holdover..get ready. Nothing beats a live stinky nightcrawler, or Alabama/Georgia jumper wiggling furiously at the bottom of the water.