Although you might not find plenty of 5 star hotels all around Latvia, you will find comfortable places to stay for a reasonable price. There are many hotels to choose from. Prices start from 20 LVL outside of Riga and from 40 LVL in Riga.
Network of youth hostels (http://www.hostellinglatv...) is also developing. Dormitory rooms come around 10 lats, single, double rooms start from 20 lats and above.
Camping in parks is usually not allowed.As regards the stealth camping- most of rural land is private, but camping there is always possible; common sense is to ask for a permission of the owner, which in most cases will be gladly granted. However, if there's no such chance, but you decide to camp there nevertheless and are later asked to move, you have to. Paying a small amount of money 1-2 lats helps in most such cases. Overall, camping outdoors on privately owned land is widely understood, common and accepted; however, staying in one place for more than two days, or really close to a home is not considered good manners. Follow the common sense of stealth camping.
Indicated free camp sites can be found in Latvia, especially in national parks, you can easily camp there.Commercial campgrounds as small businesses are becoming more and more widespread.
So called guest houses and country houses some on farms are arguably the best places to stay at in the countryside, and usually for much less money than hotels and better quality than hostels, due to very limited numbers of guests and more personal oriented and specialized service usually run by families. These come with full amenities and some follow the hotel star ratings. These also provide many recreational activities- from the Latvian popular ancient "pirts" sauna to horse rides etc. This is not only a good way to spend the night, but also an option to spend your holiday. However, usually, guest houses should be called up earlier than the day you plan to arrive, but this can vary depending on the place. Guest houses can be found fairly frequent throughout the country and are usually listed on tourist booklets.