Noratus Khachkar Cemetery. This is the largest khachkar cemetery in the world. South of the city, it's a nice drive along some of the eastern shores of the lake. The village of Noratus also has the tiny, quaint, Daputs Vank Church
Do
The area has swimming of course, but there is also wind surfing on the lake, and some sail, paddle and row boats. Hiking and camping opportunities are endless as well.
Buy
If you live in Yerevan, and are in this area, you can buy fresh fish, crawdads, marinated fish patties that you can take home to barbecue/fry immediately or freeze, and smoked fish.
Eat
Fish! And of course crayfish/crawdads. These are the main products of the region, and whether you eat the fish barbecued, fried or smoked, it will be delicious. The crawdads with a beer are excellent as well. The Harsnaqar hotel complex near town has some unbelievably good crawdad kebabs, which aren't cheap, but might be worth splurging on.
There are some fast food place in town, and cafes, but most of the good places to eat are on the shores of the lake, a bit north.
Drink
There are no special places to drink here aside from a few cafes, but wherever food is served, alcohol is available. Most places have a limited selection of vodkas, cognac, wine and beer.
Sleep
Although there are some hotel options in the city, your best bet is to find accommodations at one of the lakeside hotels, camp, or stay in Yerevan.
Contact
Get out
Getting out options are the same as those getting in. Vans, buses and taxis.