Drain the tuna if you're using tuna "in oil" or in water. The oil used is usually soybean which is not healthy. IF you can find tuna in Extra Virgin Olive Oil, use it! Don't drain it!!!
I'm a fan of crunchy vegetables in my tuna salad. One of the best plain tuna sandwiches I've ever had is the one at Subway. I asked, and theirs is just tuna and mayo. Tuna is very versatile. Serve this with crackers, scoop it onto a tossed salad, serve it in a Romaine lettuce wrap. . .Be creative! Have fun with your cooking! . .Lin