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ANYONE GOT ANY POLITE WAYS OF DECLINING?
How about being honest with her?
Tell her you had a great time with her, but you are not interested in anything more. This is true manhood in my opinion. Taking responsibility for your actions. It's totally OK to sarge and seduce woman, even though you don't want anything more from them. As long as you are always open and honest about your intentions, that's fine!
You could even be honest about practicing your pick up lines, or about improving your seduction skills and thanking her for her great feedback. Whatever, just enjoy the play!

Don't take rejecting her too seriously; it makes me think you are yourself still afraid of rejection and therefore scared to reject her, feeling guilty about it? You shouldn't! You're allowed to enjoy yourself!