An etiquette dilemma

So I've been itching to do another race. I know I have Ride for Heart coming up, and a 5k a few weeks later, and that should be enough... but I've caught the racing bug, and I want more, more, more. Looking for options on the Running Room website, I hit upon a great idea: why not take my dad to the father's day 5k?

My dad was kind enough to drive me to my last 5k, and cheer for me and take pictures too (though I have yet to see them!). He was so excited by the whole event, and realizing the wide range of abilities to which it caters, that he told me he wanted to walk it next year. I observed that there was no need to wait that long - there are 5ks all over the place. I think it's really great that he wants to do this and get in shape - so what better incentive than to sign us both up for June 18th? I asked him if he was game, and he agreed, so though I haven't officially entered yet, it's safe to say I'm committed.

However, this raises my dilemma: I was originally looking to squeeze in an extra 5k because I felt the urge to race. But if this is my present to my father, wouldn't it be much nicer if I stuck with him and walked it too? And wouldn't it in fact be rather rude to say: "happy father's day... see you at the finish line!"

Thus, I'm putting off entering because I haven't resolved this question yet; and if I'm going to walk, I'm bloody well going to sign up as a walker: my run time may be slow, but I'd still like to make an official distinction between whether or not I'm racing. I'm kind of annoyed that I put myself in this bind. Would it be enough to go on supportive father-daughter-bonding training walks with him, and do my own thing on race day - or is the right thing really to spend the event together, suck it up, have fun, and focus on July 14th as my next "real" race?

Argh. What would "Ask Miles" think?