I have a small johnboat, which I usually use - '69 Sears, for the smaller lakes, its about 10 ft long and very thin and shallow that works pretty good with 50 pound thrust trolling motor. I also have a '70 Crestliner that is 16 ft. long semi-V that I use on the Mississippi River with 15 hp. I have been looking for a prowler type boat (about a year) that is under $500 and is very sturdy and portable and with high sides or good weight capacity, to more or less replace my old johnboat. Then I figure I will buy a bike for (much needed) excercise. I have also been thinking the last few weeks about getting a VERY small canoe or a one person kayak. This would give me some (much needed) excercise by rowing, too. However, I could also be fishing. I would want one that is portable and would be VERY stable for about $500, also. I would like to hear your thoughts on this. Should I get a canoe and use all three boats (semi-V, johnboat, and canoe/kayak), or should I just totally replace my johnboat with a prowler and buy a bike for excercise? I mean, I've been in a canoe (my parents own canoes), but how much excercise is it compared to a bike? Would it be better to get a bike and ride it about 3 times a week for about 5 miles (which would cut into my fishing time) or would it be better just to take a canoe out in place of my johnboat about once a week fishing and paddling around my local lakes. I know I would probably stick to a canoeing regime. Does anybody know any sites or charts that show calories burned biking and paddling vs. distance or length of time? Also, what makes/models would be good for me? P.S. I am looking at losing weight and strengthening my heart, not muscular training.