I think I'll be starting MGS2 in a couple hours, playing in HD on the Legacy Collection. Any tips before I get started?
-Avoid drowning
-Turn the game console off right now!
You may want to lower your expectations for MGS 2 a bit even if you had a good time with Snake Tales, at least for the first half of Big Shell. There are a lot of not-so-stellar setpieces like constantly backtracking, bomb removal galore, some boss fights that don't feel nearly as good as 1's (ugh, Fatman) and other small stuff. It's the most "flawed" game of the MGS franchise as far as gameplay design goes, which is why I don't consider it as good as 1, 3 and V even though it has by far my favorite plot of the saga.
It's still a great game though and has my favorite endgame of any Metal Gear. I really love how crazy it gets and it has my favorite depiction of the Patriots bar none.