when i was a kid, my family used to rent a cabin there for two weeks every August ..
the actual Village of Lake George isn't much ... there's a Revolutionary War fort there that makes an interesting tour ... the rest of it is mini-golf, amusement parks and restaurants ... oh, and a beach ... there also are large tourist boats that cruise up the lake ... you can also go para-sailing there ...
if i were going there, i wouldn't stay right in Lake George ... go up the lake on route 9N and stay in either Diamond Point or Bolton Landing ... btw, bike riding there is very difficult ... route 9N is pretty much the only road along the lake and it's very narrow ...
they main attraction Lake George has, and it really is spectacular, is boating ... it's expensive ... renting a decent motor boat for a week costs somewhere around a grand ... there's nothing more beautiful, though, than making a run from one end of the lake to the other ... it's 32 miles long with mountains on either side ... once you get North of Bolton Landing, and past the Sagamore Hotel, you enter the Narrows ... there are tons of little islands in there ... one island, named Glen Island, has a Post Office and a Ranger station ... you can go there and get a camping permit for any of the islands ... on some islands, there's only one campsite so you can have the whole island to yourself ... just watch out for the rattlesnakes ...
the lake is really, really cold ... many people swim there but i like warmer water ... we usually go there just after Labor Day (the rates go down by half) but the lake can get really rough that time of year ... we've thought of doing "kayak camping" but getting stranded in bad weather (4 foot choppy waves) has kept us from going ...
i vaguely remember a golf course in Bolton Landing with great views of the lake ... there's also tons of antique shops in nearby Warrensburg.
you might want to contact the Bolton Landing Chamber of Commerce ... they can help you with trip planning ... here's their website:
http://www.boltonchamber.com/