The Islanders join the NHL’s preseason fun with a trip to Manhattan, where the league’s most sober and rational fans hang out. Who’s ready for some preseason hockey?! I know you are, yeah you there in the back. It all got underway for the NHL this weekend, and the Islanders join the party tonight as they face the Rangers at the Garden. Allegedly the game will be broadcast on MSG and NHL Network. Islanders News The Islanders are ready for some tests as they begin their six-game preseason set. [Newsday] Saturday camp notes: Varlamov returns, Koivula still out. [Isles] Noah…