the obvious disney stuff or you can visit a spring
sad, use to live in kissimmee but wasn't interested in fish etc. you can also do what the locals do and hang in publix parking lot and drink. there's also a rodeo stadium and maybe some events. use to be a airboat tour in area that look cool.
food wise, chains glory. for better food you may have to head to orlando and depends on what you like. mom and pop asian food is in colonial drive area.
or goto winter haven where flowmsp is from. more lakes and fishing and legoland. ha i use to live in winter haven too!