Getting to the Aquarium is an easy trip using the local bus from the bus-station - the Aquarium being the terminus, and it is interesting to see residential rather than tourist areas along the route. (The Otaru tourist map/info gives great information about use of local bus, etc. - make sure you pick one up, either from your hotel or from the Tourist Info Centre down by the canal.) It is a small aquarium, but well maintained and a pleasure to walk around, and it schedules some good demonstrations/shows. It is a steep walk down to sea-level pools, but with an escalator to get you back up to the main exhibit area. Lovely views across the bay and town. (If mobility is a problem for you, you need to be aware of a lot of steps up to the aquarium (or a fairly steep slope) from the bus stop.
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