Zstep,

You are correct that Athlone is not on the tourist radar. It's a workaday town with what the locals need. I would concentrate on other things. And you have them all figured out already. Clonamcnoise is a must on that route. I really enjoyed Belvedere House & Gardens. I loved the legend of the "Jealous Wall". Belvedere is a little south of Mullingar near the golf club. Last time I was there it was not well signposted so just head for the "golf" sign.

You might fit in Locke's but I would put it last on your list. If you don't have time for it, that's okay.

Michele