Looking for a workout plan without weights

I'm currently eating healthy and starting to bike 10 miles a day. I'm looking to add a little extra on the cheap.

I don't have weights and don't plan on buying any just yet. Trying to get as much as I can without spending too much or joining a gym. Not looking to get muscular or toned or whatever, just looking to drop some weight before a trip in November and figure doing 45 minutes of pushups/pullups/crunches/situps/whatever 3x a week will help in the long run.

I don't want to invent my own workout plan. I know there's a science to doing certain muscle groups and letting them rest. I did some googling but there's so many "regimes" and most of them are just an in between the gym thing.

So can anyone help me out with some basics?

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