Depending on how big a mountain you want to view from your lakeside, there is a mountain with lakes in its vicinity that is just a bit over an hour's drive from Boston. Mt. Wachusett, in central MA, might work, though I have no idea what is available in the way of lakefront properties.
These links lead to pages with a couple of pictures of the area:
Mount Wachusett - Wikipedia, the free encyclopedia
http://wawa.wachusett.com/images/pdfs/Winter%202004/EnvirArt/kiosk02_vista_trail_tbgd.pdf (broken link)
If you want to check mapquest to get an idea of the number of lakes in the area, the town to enter is Princeton.
I might also suggest the area near Keene, NH, which is a couple of hours from Boston, and has Mt. Monadnock in the vicinity. Another area that might offer some possibilities would be the lakes region of central New Hampshire. Depending on your location, you're probably looking at somewhat over a two-hour drive to Boston. This area is immediately south of the White Mountains foothills, with views of some smaller mountains from many of the lakes. I don't know what your budget is, but one word of caution about that area is that lakeside property will be expensive. This is a popular vacation region as well, so I'm not sure how many isolated lakeshore sites are available. It's an area that's at least worth checking more closely.
An area you might really want to check very closely would be the lakes country in south-central Maine, which is basically the eastern part of the same group of lakes as the NH lakes region. There are lots of little towns around there, but look up Windham and Bridgton, two of the area's hub towns, to zero in on the general area I'm referring to. This area could present the same issues as the NH lakes region with cost and questions about whether you can find an isolated property. If those issues could work out, the advantage of this area is that you're only about 45 minutes or less from Portland, ME, a nice little city with some cool old architecture, which is often seen as kind of a small version of Boston.
I'm not so familiar with the area, but if there are any areas with lakes and mountain views in central CA, fairly close to the Bay Area, you might look into that area as well, since San Francisco is another city that has some of that old-style appearance, somewhat similar to the appearance of Boston, and the Bay Area does not have so much rain and gray weather as the Northwest.