Enjoy late summer by renting an electric boat down on Lake Union. You can drive yourself around and look at the houseboats and the parks and the dry docks and other people's boats and the skyline and the bridges and the beaver dams and the water. There is a big table onboard, and you can bring snacks and cocktails. The boat holds 10 people and is completely silent, letting you listen to music and have maritime conversation with your shipmates. (Electric Boat Company, 2046 Westlake Ave N, www.theelectricboatco.com. 10 am–9 pm, $89/hour.)