Basic exercises to do regularly to help get fit?

CobaltTree
I have a trip to the beach coming up in July and I'm not as fit as I would like to be. I would like to get in shape before the trip and I was wondering what are some basic exercises that I could do regularly to help lose a little weight? I'm already changing the way I eat. I've eliminated carbonated drinks and coffee as well as reducing the amount of sugar I eat. I'm not expecting to get a six pack in 3 months but I want to be fit enough to feel comfortable being shirtless in front of a bunch of girls.
Basic exercises to do regularly to help get fit?
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