Any of the 17 local tourists offices will provide information. Those 12,000 rivers offer marvellous opportunities for boating and kayaking, especially the Salaca in Vidzeme with its riverbank campsites, along the Abava, and on the Gauja, where there are 19 camps along 93 km of water. Canoe hire and package tours can be arranged at Cesis and Sigulda. Not that you have to be on a package, you can always do your own thing. The same rivers offer enormous scope for anglers.
Trout is a favourite catch.
Pike are a possibility. Licences are issued locally. Bicycles are easily hired and in this relatively flat country biking holidays make serious sense. In winter, from December to mid-February, you can go cross country skiing almost anywhere. There are lifts for downhill runs at Ergli and Sigulda, while at Valmeira snow making machines help the piste.