The Beaver Meadow entrance is the one closest to The Landing. But you can go into any of the entrances. Just make sure you get a reservation! https://www.nps.gov/romo/planyourvisit/timed-entry-permit-system.htm
Rocky Mountain National Park has some of the best hikes in Colorado. 13 of the best are listed here. Note: You will need your National Park Pass (or to pay a $30 daily entrance fee that you can purchase at the park entrance) PLUS a time entry permit for RMNP. To secure your timed entry permit please visit - https://www.nps.gov/romo/planyourvisit/timed-entry-permit-system.htm
Be careful here! The elevation gets up to 11,716 and the road can be very windy. You will need a Rocky Mountain timed entry permit for this scenic drive and overlook. Trail Ridge Road is one of the most gorgeous drives in Colorado. On your way also stop at Many Parks Curve Overlook and Rainbow Curve Overlook. Forest Canyon is said to be the best overlook in Rocky Mountain National Park.