Hi, Vibes - I guess I have the best luck with chorus songs. We've had a good thread on chorus songs here (click), and I'm sure you'll find lots of good suggestions there. Camp songs (click) work well, too. If you do a DT Keyword Search for camp, you'll find lots.
I suppose my most successful song is "Singin in the Rain," with hand motions and hip swivels and "toody-toddy, toody-toddy, toody-ta-ta" between choruses (you have to see it to learn it). I've gotten tired of it, but people often ask me to sing The MTA Song. I really like "Hava Nagila," and "I've Been Working on the Railroad."
Have a good time. If you have fun, your audience will, too.