If you are looking for something to do in the summer most cities have nice hiking trails for beginners in larger parks and on the outskirts of the city proper. It can be fun for you a couple of friends to make hiking a regular excursion.
I have found that going and buying our supplies together, like hiking boots and backpacks, can be quite enjoyable. Plus some stores will give you discounts if you are buying several pairs of hiking boots at once.
It is a good idea to try the hiking boots on in store and really walk around in them for a few minutes. If they poke you at all don't get them as this usually just gets worse.