Going to Marco Island/Naples FL.-Any Suggestions?

At the end of the month my family (2 daughters-16 & 9) & I are vacationing at The Marco Island Marriot Resort for 9 days. I am looking for good recommendations for breakfast, lunch & dinner. Some days we will break the bank, but most days just great, affordable, casual, laid back is what we would be looking for. Ideas?

Thanks
Pammy T.