What they do at simular type of camp near here is provide first and formost an organized routine, then you just plug in activities throughout the day into that. canoeing, swimming, hiking, fishing etc. depending on what you have available. Are you planning one week stays, 2 weeks, a month? One camp plans one month blocks so everyone starts at the same time.The place is always full all summer.
A good place you might want to look for ideas is other camps, see how they are structured.