outdoor walks

So I am looking at all of these cat trees, and I am finding that they are soooo expensive which I wouldn't mind but they also are ugly and not well made! So I am wondering several things: What is everyone's favorite cat tree, or cat scratching/climbing set-up? Cat tree vs. cat climbing walls...

Kato gets very active around 9am and 6pm and has a lot of energy. He is indoor only. Should I take him on walks to burn off some of his energy? What leash recommendations? Do I NEED rabbies vaccination? (I'd rather not but will if necessary) Thanks!