Visit the 'Muiderslot', a beautiful castle on the waterside.
Within easy reach of a bicycle day trip are the fortified towns of Weesp and Naarden. Practical information on cycling in the region on this linkpage.
Boat trips are possible on the river Vecht and on the Gooimeer former Zuiderzee. Also rental of all sizes of rowing/motorboats and sailing ships, with or without captain.