The fastest way to get there is to be on World #330 since it’s the house party world, use the House teleport (runes), then find a host with high Construction level and enter his/her house and use the Portal Nexus to teleport to Lunar Isle. Portal Nexus Teleport, Old School Runescape...
Note that boosting above level 99 will have no effect on the chopping rate but inside the guild, you will be able to chop at a faster rate by boosting above level 99 using a Woodcutting cape or a Dragon Axe boost. The guild is located in the south-western part of the Hosidius ...