This chariot bike trailer is great for us when we're camping!
So, this stroller looks a bit weird in person, since your kid is totally enclosed in it, but it seems cool. We haven't gotten one of them, but I think that we'll get this one when we finally break down to get a bike stroller. They are available at REI, if you also wanted a place to see them in person. But, they have things so you can use it as a plain stroller, a bike stroller, a jogging stroller, or a cross country skiing stroller. (There is a different kit for each of those functions.) But, I'd say to go to REI or Toys R Us and try some out to see if you like how they feel...
This is far more than a bike trailer! It can be used for strolling, jogging, hiking, biking, and even X-COUNTRY SKIING! How sweet is that? You can use the trailer with the flip of a switch for all kinds of outdoor activities (depending on the options you select during purchase). A workout for you, and fun for your kid. Make their day. Take them out in this. I swear it's the most fun I had as a kid. (ok maybe just ONE of the most fun things ever)