The Trop has a small poker room now where you can get your feet wet, $1-3 spread limit (you can choose to bet $1-3 on all betting rounds).
You're in a good location -- you can walk across the pedestrian overpass to the Excalibur, which has $1-3 spread and $2-6 spread.
Across the other overpass, you'll find the MGM Grand, which has a really nice room - you can find $2/4, $3/6 and up. There are lots of young players who don't know so much about limit.
Bally's is good -- they have $2/4 and $4/8, the Aladdin has some decent and loose $3/6 tables.
$1,000 is plenty for the trip. I'd probably play $3/6 and $4/8 if you're up to it. If so, then you should play at the Bellagio and the Wynn, both because they are beautiful poker rooms and because you can find some great games. $4/8 is the lowest limit at those rooms, so inexperienced people who stay there and want to play poker are starting out at $4/8.